1. Communication (Level 2)
2. Animal communication
3. Argumentation theory
4. Augmentative and alternative communication
5. Computer-mediated communication
6. Communication studies
7. Conference call
8. Conversation
   1. Interview
9. Cross-cultural communication
10. Debate
11. Discourse
12. Figure of speech
    1. Scheme (rhetoric)
       1. Alliteration
    2. Trope (literature)
       1. Allegory
       2. Innuendo
       3. Metaphor
       4. Sarcasm
13. Human communication
    1. Interpersonal communication
    2. Intrapersonal communication
14. Mass communication
15. Means of communication (Level 4)
16. Meeting
    1. Academic conference
    2. Convention (meeting)
    3. Popular assembly
    4. Summit (meeting)
    5. Symposium
    6. Town hall meeting
    7. Trade show
17. Meta-communication
    1. Paralanguage
18. Organizational communication
19. Propaganda (Level 4)
    1. Propaganda in China
    2. Propaganda in the Soviet Union
20. Public relations (Level 4)
    1. Political communication
    2. Science communication
       1. Popular science
21. Public speaking
22. Rhetoric (Level 4)
    1. Ethos
    2. Logos
    3. Pathos
23. Rumor
    1. Gossip
24. Small talk
25. Technical communication
26. Visual communication

This section contains 23 articles.

1. Nonverbal communication (Level 4)
2. Body language (Level 4)
3. Applause
4. Blushing
5. Booing
6. Crying
7. Eye contact
8. Facial expression
   1. Frown
   2. Smile
   3. Wink
9. Kinesics
10. Laughter
11. Screaming

This section contains 9 articles.

1. Gesture
2. Bowing
3. Curtsy
4. Head shake
5. Kneeling
6. Nod (gesture)
7. Salute
8. Shrug
9. Waving

1. Culture (Level 2)
   1. Cultural heritage (Level 4)
   2. Cultural studies
2. Body modification (Level 4)
   1. Body piercing (Level 4)
   2. Foot binding
   3. Genital modification and mutilation
      1. Castration
      2. Circumcision (Level 4)
      3. Female genital mutilation (Level 4)
   4. Tattoo (Level 4)
3. Cultural assimilation (Level 4)
4. Popular culture (Level 3)
5. Tradition (Level 4)
   1. Oral tradition (Level 3)
   2. Greeting (Level 4)
      1. Greeting card
      2. Handshake
      3. Hug
6. Taboo (Level 4)
   1. Human cannibalism (Level 4)
7. Do it yourself

1. Culture of Africa
   1. Culture of Nigeria
2. Arab culture
3. Culture of Asia
   1. Culture of Buddhism
   2. Chinese culture
   3. Culture of India
   4. Culture of Indonesia
   5. Islamic culture
   6. Culture of Japan
      1. Japanese popular culture
         1. Kawaii
   7. Culture of Korea
4. Culture of Oceania
   1. Culture of Australia
   2. Culture of Polynesia
5. Culture of Latin America
   1. Culture of Mexico
   2. Culture of South America
      1. Culture of Brazil
6. Western culture
   1. Culture of Europe
      1. Culture of France
      2. Culture of Germany
      3. Culture of Greece
      4. Culture of Italy
      5. Culture of the Netherlands
      6. Culture of Poland
      7. Culture of Russia
      8. Culture of Spain
      9. Culture of the United Kingdom
   2. Culture of the United States

1. Birthday (Level 4)
   1. Quinceañera
2. Festival (Level 3)
   1. Burning Man
   2. Carnival (Level 4)
      1. Mardi Gras
   3. Harvest festival (Level 4)
      1. Thanksgiving
      2. Samhain
   4. Met Gala
   5. Music festival
      1. Coachella
      2. Rave
      3. Woodstock
   6. Oktoberfest
   7. World's fair (Level 4)
   8. Yule
3. Holiday (Level 4)
4. National day
5. Public holiday
6. Sabbath (Level 4)
7. Spring break

This section contains 78 articles.

1. April Fools' Day
2. Armistice Day
3. Earth Day
4. Father's Day
5. Halloween (Level 4)
   1. Day of the Dead
   2. Trick-or-treating
6. Kwanzaa
7. May Day
8. Mother's Day
9. New Year (Level 4)
   1. New Year's Day
   2. New Year's Eve
10. Nowruz (Level 4)
11. Remembrance Day
12. Saint Patrick's Day
13. Valentine's Day
14. Victory Day (9 May)
15. International Women's Day
16. International Workers' Day

This section contains 4 articles.

1. Buddha's Birthday
2. Bodhi Day
3. Songkran (Thailand)
4. Vesak

This section contains 15 articles.

1. Lent
   1. Ash Wednesday
2. Advent
3. Christmas (Level 4)
   1. Christmas traditions
      1. Christmas tree
   2. Christmas Eve
   3. Boxing Day
   4. Epiphany (holiday)
4. Easter (Level 4)
   1. Easter traditions
      1. Easter egg
   2. Good Friday
   3. Palm Sunday
   4. Pentecost (Level 4)

This section contains 18 articles.

1. Lunar New Year
   1. Chinese New Year (Level 4)
2. Setsubun
3. Double Third Festival
   1. Hinamatsuri
4. Cold Food Festival
5. Qingming Festival
6. Dragon Boat Festival
7. Qixi Festival
   1. Chilseok
   2. Tanabata
8. Ghost Festival
9. Obon
10. Mid-Autumn Festival
11. Confucius' Birthday
12. Double Ninth Festival
13. Dongzhi (solar term)
14. Singles' Day

This section contains 7 articles.

1. Ashura
2. Bishwa Ijtema
3. Eid al-Adha
4. Islamic New Year
5. Mawlid
6. Ramadan (Level 4)
   1. Eid al-Fitr (Level 4)

This section contains 11 articles.

1. Hanukkah
2. Passover (Level 4)
3. Purim
4. Rosh Hashanah (Level 4)
5. Shabbat
6. Shavuot
7. Shemini Atzeret
8. Simchat Torah
9. Sukkot
10. Tisha B'Av
11. Yom Kippur (Level 4)

This section contains 3 articles.

1. Diwali (Level 4)
2. Holi (Level 4)
3. Pohela Boishakh

1. Subculture (Level 4)
2. Beatnik
3. Cannabis culture
4. Counterculture
   1. Hippie
5. Fandom (Level 4)
   1. Anime and manga fandom
      1. Otaku
   2. Furry fandom
   3. Science fiction fandom
6. Gamer
7. Geek
8. Goth subculture
9. Heavy metal subculture
10. Hip-hop culture
11. Hipster (contemporary subculture)
12. Internet culture
13. Lolita fashion
14. Motorcycle club
15. Nerd
16. Punk subculture
17. Sports fandom
18. Youth subculture
    1. Skinhead

1. Education (Level 2)
   1. Early childhood education (Level 4)
      1. Kindergarten
      2. Preschool
   2. Primary education (Level 4)
      1. Primary school
   3. Secondary education (Level 4)
      1. Gymnasium (school)
      2. Middle school
      3. Secondary school
   4. Tertiary education
      1. Postgraduate education
      2. Undergraduate education
   5. Education in the United States
   6. Education in China
2. Academic degree
   1. Undergraduate degree
      1. Bachelor's degree (Level 4)
   2. Master's degree (Level 4)
      1. Master of Business Administration
   3. Doctorate
      1. Doctor of Philosophy (Level 4)
   4. Licentiate (degree)
3. Academic dishonesty
4. Academy
5. After-school activity
6. Alternative education
7. Business education
   1. Business school
8. Class (education)
9. Classroom
10. College (Level 4)
    1. Community college
    2. Liberal arts college
    3. Women's college
11. Compulsory education
12. Course (education)
    1. Course credit
    2. Massive open online course
13. Curriculum (Level 4)
14. Diploma
15. Educational assessment
    1. Evaluation
    2. Grading in education
16. Educational institution
17. Educational technology
18. Exam (Level 4)
    1. Bar examination
    2. Multiple choice
    3. Oral exam
    4. Standardized test
19. Graduation
20. Homeschooling
21. Homework
22. Language education
23. Lecture
24. Legal education
    1. Law school
25. Learning (Level 3)
    1. Skill (Level 4)
26. Lesson (Level 4)
27. Liberal arts education
28. Library (Level 3)
    1. Academic library
    2. Library classification
       1. Colon classification
       2. Dewey Decimal Classification
       3. Library of Congress Classification
       4. Universal Decimal Classification
    3. Library and information science
    4. Public library
    5. Research library
29. Mathematics education
30. Medical education
    1. Medical school
31. Montessori education
32. Music education
    1. Music school
33. Note-taking
34. Pedagogy
35. Physical education
36. Professional certification
37. Professor
38. School (Level 3)
    1. Boarding school (Level 4)
       1. Military academy
    2. Parochial school
       1. Catholic school
    3. Private school
       1. International school
    4. State school
39. Science education
40. Seminar
41. Seminary
42. Student
43. Student exchange program
44. Syllabus
45. Teaching
    1. Training
    2. Tutoring
46. Thesis
47. University (Level 3)
    1. Historically black colleges and universities
    2. Institute of technology
48. Visual arts education
49. Vocational education
    1. Vocational school
50. Waldorf education

1. Carnegie library

This section contains 1 article.

1. Library of Alexandria (Level 4)

This section contains 3 articles.

1. Library and Archives Canada
2. Library of Congress (Level 4)
3. New York Public Library

This section contains 5 articles.

1. National Library of China
2. National Library of India
3. National Library of Israel
4. National Diet Library
5. Shanghai Library

This section contains 12 articles.

1. Berlin State Library
2. Bodleian Library
3. British Library (Level 4)
4. Royal Library, Denmark
5. Biblioteca Nacional de España
6. Bibliothèque nationale de France
7. German National Library
8. National Library of Sweden
9. Russian State Library
10. National Library of Russia
11. Vatican Library (Level 4)
12. Vatican Apostolic Archive

1. University of al-Qarawiyyin
2. Makerere University

This section contains 2 articles.

1. Al-Azhar University (Level 4)
2. Cairo University

This section contains 2 articles.

1. University of Cape Town
2. Stellenbosch University

This section contains 7 articles.

1. University of Alberta
2. University of British Columbia
3. McGill University
4. McMaster University
5. Université de Montréal
6. University of Toronto (Level 4)
7. University of Waterloo

This section contains 1 article.

1. National Autonomous University of Mexico (Level 4)

This section contains 40 articles.

1. Brigham Young University
2. California Institute of Technology
3. Georgetown University
4. Johns Hopkins University (Level 4)
5. Massachusetts Institute of Technology (Level 4)
6. New York University
7. Seven Sisters (colleges)
8. United States Air Force Academy
9. United States Military Academy
10. United States Naval Academy
11. University of Chicago

This section contains 5 articles.

1. Duke University
2. Stanford University (Level 4)
3. University of California, Berkeley (Level 4)
4. University of Notre Dame
5. University of Virginia

This section contains 9 articles.

1. University of Michigan
2. Michigan State University
3. Northwestern University
4. Ohio State University
5. Pennsylvania State University
6. Purdue University
7. University of Wisconsin–Madison
8. University of California, Los Angeles
9. University of Southern California

This section contains 9 articles.

1. Ivy League
2. Brown University
3. Columbia University (Level 4)
4. Cornell University
5. Dartmouth College
6. Harvard University (Level 4)
7. University of Pennsylvania
8. Princeton University (Level 4)
9. Yale University (Level 4)

This section contains 1 article.

1. Juilliard School

This section contains 5 articles.

1. University of California
2. Claremont Colleges
3. State University of New York
4. University of North Carolina
5. University of Texas System

This section contains 4 articles.

1. Federal University of Rio de Janeiro
2. Pontificia Universidad Javeriana
3. University of Buenos Aires
4. University of São Paulo

1. Chulalongkorn University
2. University of Indonesia
3. King Abdulaziz University
4. National Taiwan University

This section contains 10 articles.

This section contains 8 articles.

1. Fudan University
2. Harbin Institute of Technology
3. Nanjing University
4. Peking University (Level 4)
5. University of Science and Technology of China
6. Shanghai Jiao Tong University
7. Tsinghua University (Level 4)
8. Zhejiang University

This section contains 2 articles.

1. Chinese University of Hong Kong
2. University of Hong Kong

This section contains 5 articles.

1. Indira Gandhi National Open University
2. University of Calcutta
3. Indian Institutes of Technology (Level 4)
4. University of Madras
5. University of Mumbai

This section contains 1 article.

1. University of Tehran

This section contains 2 articles.

1. Hebrew University of Jerusalem
2. Technion – Israel Institute of Technology

This section contains 11 articles.

1. Hokkaido University
2. Keio University
3. Kyoto University (Level 4)
4. Kyushu University
5. Nagoya University
6. University of Osaka
7. Tohoku University
8. University of Tokyo (Level 4)
9. Tokyo Institute of Technology
10. Tokyo Medical and Dental University
11. Waseda University

This section contains 2 articles.

1. Nanyang Technological University
2. National University of Singapore

This section contains 5 articles.

1. Ewha Womans University
2. KAIST
3. Korea University
4. Seoul National University
5. Yonsei University

1. Charles University in Prague
2. University of Coimbra
3. University of Copenhagen (Level 4)
4. University of Helsinki
5. Istanbul University
6. Jagiellonian University
7. Trinity College Dublin

This section contains 2 articles.

1. University of Innsbruck
2. University of Vienna (Level 4)

This section contains 3 articles.

1. Ghent University
2. KU Leuven
3. UCLouvain

This section contains 10 articles.

1. Aix-Marseille University
2. Collège de France
3. Le Cordon Bleu
4. École normale supérieure (Paris)
5. École polytechnique
6. Sorbonne University (Level 4)
   1. Pierre and Marie Curie University
   2. University of Paris
7. University of Strasbourg
8. Sciences Po

This section contains 24 articles.

This section contains 9 articles.

1. RWTH Aachen University
2. Technische Universität Berlin
3. TU Braunschweig
4. Technische Universität Darmstadt
5. TU Dresden
6. Leibniz University Hannover
7. Karlsruhe Institute of Technology
8. Technical University of Munich
9. University of Stuttgart

This section contains 15 articles.

1. Free University of Berlin
2. Humboldt University of Berlin (Level 4)
3. University of Bonn
4. University of Cologne
5. Goethe University Frankfurt
6. University of Freiburg
7. University of Göttingen (Level 4)
8. University of Hamburg
9. Heidelberg University (Level 4)
10. Leipzig University
11. University of Mainz
12. Ludwig Maximilian University of Munich (Level 4)
13. University of Münster
14. University of Tübingen
15. University of Würzburg

This section contains 5 articles.

1. University of Bologna (Level 4)
2. University of Padua
3. Polytechnic University of Milan
4. Sapienza University of Rome (Level 4)
5. University of Naples Federico II

This section contains 6 articles.

1. University of Amsterdam
2. Delft University of Technology
3. University of Groningen
4. Leiden University
5. Erasmus University Rotterdam
6. Utrecht University

This section contains 3 articles.

1. Russian Academy of Sciences
2. Saint Petersburg State University
3. Moscow State University (Level 4)

This section contains 7 articles.

1. Autonomous University of Barcelona
2. University of Barcelona
3. Autonomous University of Madrid
4. Complutense University of Madrid
5. University of Navarra
6. Pompeu Fabra University
7. University of Salamanca

This section contains 3 articles.

1. Karolinska Institute
2. Lund University
3. Uppsala University

This section contains 3 articles.

1. École Polytechnique Fédérale de Lausanne
2. ETH Zurich (Level 4)
3. University of Zurich

This section contains 25 articles.

1. Eton College
2. Summerhill School
3. University of London
4. University of St Andrews

This section contains 21 articles.

1. University of Birmingham
2. University of Bristol
3. University of Cambridge (Level 4)
4. Cardiff University
5. Durham University
6. University of Edinburgh
7. University of Exeter
8. University of Glasgow
9. Imperial College London
10. King's College London
11. University College London
12. University of Leeds
13. University of Liverpool
14. London School of Economics
15. University of Manchester
16. Newcastle University
17. University of Nottingham
18. University of Oxford (Level 4)
19. Queen's University Belfast
20. University of Sheffield
21. University of Warwick

1. University of Auckland

This section contains 8 articles.

1. Australian National University
2. University of Adelaide
3. University of Melbourne
4. Monash University
5. University of New South Wales
6. University of Queensland
7. University of Sydney
8. University of Western Australia

This section contains 21 articles.

This section contains 12 articles.

1. Acculturation
2. Anthropology (Level 3)
3. Biological anthropology
4. Cultural anthropology
5. Cultural diffusion
6. Economic anthropology
7. Linguistic anthropology (Level 4)
8. Patriarchy
9. People
10. Political anthropology
11. Anthropology of religion
12. Social anthropology

This section contains 5 articles.

1. Boasian anthropology
2. Cultural materialism (anthropology)
3. Sociocultural evolution
4. Structural anthropology
5. Symbolic anthropology

This section contains 4 articles.

1. Farmer (Level 4)
2. Fisherman
3. Hunter-gatherer (Level 4)
4. Nomad (Level 4)

This section contains 10 articles.

1. Cultural relativism
2. Diaspora (Level 4)
3. Ethnology (Level 4)
4. Ethnicity (Level 2)
5. Ethnocentrism (Level 4)
6. Ethnography (Level 4)
   1. Participant observation
7. Group living
8. Indigenous peoples (Level 3)
9. Self-determination (Level 4)

This section contains 108 articles.

1. Arabs (Level 4)
   1. Bedouin
2. Austronesian peoples (Level 4)
   1. Melanesians
   2. Micronesians
   3. Polynesians
3. Black people
4. Creole peoples
5. Jews (Level 4)
6. Multiracial people
   1. Mestizo
   2. Zambo
7. Turkic peoples (Level 4)
8. White people

This section contains 17 articles.

1. African Pygmies (Level 4)
2. Bantu peoples (Level 4)
   1. Tutsi
   2. Zulu people (Level 4)
3. Berbers (Level 4)
   1. Tuareg people
4. Copts
5. Dogon people
6. Ewe people
7. Fula people
8. Habesha peoples
   1. Amhara people
9. Hadza people
10. Hausa people
11. Maasai people (Level 4)
12. San people (Level 4)
13. Yoruba people (Level 4)

This section contains 34 articles.

1. African Americans
2. Latin Americans

This section contains 32 articles.

1. Indigenous peoples of the Americas (Level 4)
2. Indigenous peoples in Canada
   1. Cree
   2. Inuit (Level 4)
   3. Wyandot
3. Indigenous peoples of Mexico
   1. Maya peoples (Level 4)
   2. Nahuas
   3. Zapotec peoples
4. Indigenous peoples of South America
   1. Arawak
   2. Carib
   3. Guaraní people
   4. Mapuche
   5. Quechua people (Level 4)
   6. Tupi people
5. Native Americans in the United States
   1. Apache
   2. Cherokee (Level 4)
   3. Chickasaw
   4. Choctaw
   5. Chumash
   6. Iroquois (Level 4)
   7. Muscogee
   8. Navajo (Level 4)
   9. Ojibwe
   10. Pueblo peoples
   11. Seminole
   12. Shawnee
   13. Shoshone
   14. Sioux (Level 4)
   15. Ute

This section contains 29 articles.

1. Asian people
2. Ainu people
3. Adivasi (Level 4)
4. Baloch people
5. Bengalis
6. Dravidian peoples
7. Gurkha
8. Hmong people (Level 4)
9. Indigenous peoples of Siberia
10. Javanese people
11. Kurds (Level 4)
12. Malays (ethnic group)
13. Mongols
14. Moro people
15. Pashtuns
16. Ryukyuans
17. Sentinelese
18. Taiwanese indigenous peoples
19. Yamato people
20. Yi people

This section contains 9 articles.

1. Ethnic minorities in China
2. Han Chinese (Level 4)
   1. Cantonese people
   2. Hakka people
   3. Overseas Chinese
3. Manchu people
4. Tibetans (Level 4)
5. Uyghurs (Level 4)
6. Zhuang people

This section contains 9 articles.

1. Basques (Level 4)
2. Circassians
3. Gagauz people
4. Karelians
5. Kumyks
6. Romani people (Level 4)
7. Sámi people (Level 4)
8. Slavs (Level 4)
9. Tatars

This section contains 5 articles.

1. Aboriginal Australians (Level 4)
2. Kanak people
3. Māori people (Level 4)
4. Native Hawaiians
5. Torres Strait Islanders

1. Language (Level 2)
   1. Origin of language (Level 4)
2. Artificial language
3. First language
4. Constructed language
5. Cultural emphasis
6. Fluency
7. Intensifier
8. Interpretive discussion
9. Language complexity
10. Language game
11. Language preservation
12. Lingua franca
13. Literacy (Level 3)
    1. Reading (Level 4)
14. Literary language
15. Metafunction
16. Natural language
17. Pejorative
18. Philology
19. Pidgin
20. Pronunciation
21. Proto-language
22. Second language
23. Speech (Level 3)
    1. Origin of speech
    2. Speech processing
24. Spoken language
25. Standard language
    1. Pluricentric language
26. Translation (Level 4)
    1. Language interpretation
27. Tone
28. Visual language
29. World language

This section contains 11 articles.

1. Writing (Level 2)
2. Abjad
3. Abugida
4. Alphabet (Level 3)
5. Diacritic
6. Letter (alphabet) (Level 4)
7. Logogram
8. Orthography (Level 4)
9. Syllabary
10. Transliteration (Level 4)
11. Writing system (Level 4)

1. Language acquisition
2. Babbling
3. Extensive reading
4. Input hypothesis
5. Interlanguage
6. Language development
7. Phonological development
8. Second-language acquisition
9. Speech repetition
10. Vocabulary development

This section contains 31 articles.

1. Grammar (Level 3)
2. Syntax (Level 4)
   1. Theta role
3. Sentence (linguistics) (Level 4)
4. Clause (Level 4)
5. Phrase (Level 4)
   1. Proverb (Level 4)
   2. Idiom
6. Affirmation and negation
7. Degrees of comparison of adjectives and adverbs
8. Declension
9. Description
10. Determiner
11. Formal grammar
12. Function word
13. Grammatical aspect
14. Grammatical case
15. Grammatical category
16. Grammatical conjugation
17. Grammatical gender
18. Grammatical mood
19. Grammatical number
20. Grammatical tense (Level 4)
    1. Past tense
    2. Present tense
    3. Future tense
21. Inflection
22. Nominalization
23. Possessive
24. Reduplication
25. Speech act (Level 4)

This section contains 19 articles.

1. Punctuation
2. Apostrophe
3. Bracket
4. Colon (punctuation)
5. Comma
   1. Serial comma
6. Dash
7. Ellipsis
8. Exclamation mark
9. Full stop
10. Guillemet
11. Hyphen
12. Question mark
13. Quotation mark
14. Semicolon
15. Interpunct
16. Slash (punctuation)
    1. Backslash
17. Space (punctuation)

This section contains 7 articles.

1. Spelling
2. Official script
3. Phonemic orthography
4. Silent letter
5. Spelling pronunciation
6. Spelling reform
7. Typographical error

1. Linguistics (Level 3)
2. Lexicology
3. Linguistic typology (Level 4)

This section contains 7 articles.

1. Applied linguistics
2. Computational linguistics
3. Evolutionary linguistics
4. Forensic linguistics
5. Internet linguistics
6. Neurolinguistics
7. Psycholinguistics

This section contains 39 articles.

1. Linguistic description
2. Anthropological linguistics
3. Comparative linguistics (Level 4)

This section contains 7 articles.

1. Historical linguistics (Level 4)
2. Etymology (Level 4)
3. Language change
   1. Semantic change
   2. Sound change
      1. Grimm's law
      2. Phonological change

This section contains 10 articles.

1. Phonetics (Level 4)
2. Consonant (Level 4)
   1. Rhotic consonant
3. International Phonetic Alphabet (Level 4)
4. Intonation
5. Phonics
6. Prosody (linguistics) (Level 4)
7. Stress (linguistics)
8. Vowel (Level 4)
   1. Mid central vowel

This section contains 19 articles.

1. Sociolinguistics (Level 4)
2. Accent (sociolinguistics) (Level 4)
3. Cant (language)
4. Code-switching
5. Context
6. Dialect (Level 4)
   1. Variety (linguistics)
   2. Dialect continuum
7. Diglossia (Level 4)
8. Endangered language (Level 4)
9. Jargon
10. Language death (Level 4)
11. Loanword
12. Mixed language
13. Multilingualism (Level 4)
    1. Bilingual education
14. Register (sociolinguistics)
15. Slang (Level 4)
16. Sociolect

This section contains 30 articles.

1. Theoretical linguistics
2. Cognitive linguistics
3. Functional linguistics
   1. Systemic functional linguistics
4. Generative grammar
   1. Lexis (linguistics)
5. Morphology (linguistics) (Level 4)
   1. Abbreviation
      1. Acronym
   2. Contraction (grammar)
   3. Hypocorism
   4. Morpheme (Level 4)
6. Morphophonology
7. Phonology (Level 4)
   1. Phoneme (Level 4)
   2. Syllable (Level 4)
8. Semantics (Level 4)
   1. Euphemism (Level 4)
   2. Profanity (Level 4)
   3. Reference
9. Semiotics (Level 4)
   1. Pragmatics (Level 4)
   2. Sign
      1. Symbol (Level 4)
   3. Ideogram
      1. Pictogram
      2. Emoticon
      3. Emoji
      4. Heart symbol
      5. Smiley

1. Vocabulary
   1. Word (Level 3)
2. Onomatopoeia

This section contains 21 articles.

1. Part of speech
2. Noun (Level 4)
   1. Name (Level 4)
      1. Middle name
      2. Given name
      3. Personal name (Level 3)
      4. Surname (Level 4)
   2. Honorific
      1. Miss
      2. Mr.
      3. Mrs.
   3. Proper noun
3. Verb (Level 4)
4. Adjective (Level 4)
5. Article (grammar)
6. Adverb (Level 4)
7. Conjunction (grammar) (Level 4)
8. Grammatical particle
9. Interjection (Level 4)
10. Pronoun (Level 4)
11. Adposition (Level 4)

1. Alternation (linguistics)
2. Assimilation (phonology)
3. Elision
4. Epenthesis
5. Lenition
6. Metathesis (linguistics)
7. Sandhi

1. Language family (Level 4)
2. Afroasiatic languages (Level 4)
   1. Semitic languages (Level 4)
3. Algic languages (Level 4)
4. Arawakan languages
5. Australian Aboriginal languages
6. Austroasiatic languages (Level 4)
7. Austronesian languages (Level 4)
   1. Oceanic languages
      1. Polynesian languages
8. Creole language (Level 4)
9. Dravidian languages (Level 4)
10. Eskaleut languages (Level 4)
11. Indo-European languages (Level 3)
    1. Celtic languages
    2. Indo-Aryan languages (Level 4)
       1. Bihari languages
    3. Romance languages (Level 4)
    4. Germanic languages (Level 4)
       1. Frisian languages
       2. North Germanic languages
    5. Iranian languages (Level 4)
    6. Slavic languages (Level 4)
12. Kartvelian languages (Level 4)
13. Khoisan languages (Level 4)
14. Kra–Dai languages (Level 4)
    1. Zhuang languages
15. Language isolate
16. Niger–Congo languages (Level 4)
    1. Akan language
    2. Bantu languages (Level 4)
17. Nilo-Saharan languages (Level 4)
18. Mayan languages
19. Na-Dene languages
20. North Caucasian languages (Level 4)
21. Oto-Manguean languages
22. Quechuan languages (Level 4)
23. Sign language (Level 4)
24. Sino-Tibetan languages (Level 4)
25. Trans–New Guinea languages (Level 4)
26. Tungusic languages
27. Turkic languages (Level 4)
28. Uralic languages (Level 4)
29. Uto-Aztecan languages (Level 4)

1. Braille (Level 4)
2. Arabic script (Level 3)
   1. Arabic alphabet
   2. Kufic
   3. Nastaliq
   4. Persian alphabet
3. Armenian alphabet
4. Brahmic scripts (Level 3)
   1. Mon–Burmese script
   2. Tamil script
   3. Thai script
   4. Tibetan script
5. Canadian Aboriginal syllabics
6. Chinese characters (Level 3)
   1. Seal script
   2. Simplified Chinese characters
   3. Traditional Chinese characters
7. Cuneiform (Level 4)
8. Cursive
9. Cyrillic script (Level 3)
10. Devanagari (Level 4)
11. Egyptian hieroglyphs (Level 4)
12. Glagolitic script
13. Geʽez script
14. Georgian scripts
15. Greek alphabet (Level 3)
16. Hangul (Level 4)
    1. Hanja
17. Hebrew alphabet
18. Indus script
19. Japanese writing system (Level 4)
    1. Hiragana
    2. Kanji
    3. Katakana
20. Khmer script
21. Latin script (Level 3)
    1. Blackletter
    2. Latin alphabet
22. Linear A
23. Linear B
24. Maya script (Level 4)
25. Mongolian script
26. Morse code (Level 4)
27. Ogham
28. Phoenician alphabet (Level 4)
29. Rosetta Stone (Level 4)
30. Romanization
    1. Romanization of Arabic
    2. Romanization of Chinese
       1. Pinyin
    3. Romanization of Japanese
31. Rongorongo
32. Runes (Level 4)
33. Shorthand

This section contains 11 articles.

1. Abkhaz language
2. Aymara language
3. Cherokee language
4. Georgian language
5. Guarani language
6. Hmong language
7. Japanese language (Level 3)
8. Korean language (Level 4)
9. Mongolian language
10. Nahuatl
11. Navajo language

This section contains 24 articles.

1. Afar language
2. Akkadian language (Level 4)
3. Amharic (Level 4)
4. Arabic (Level 3)
   1. Classical Arabic (Level 4)
   2. Egyptian Arabic (Level 4)
   3. Levantine Arabic
   4. Maghrebi Arabic
   5. Modern Standard Arabic
   6. Moroccan Arabic
   7. Peninsular Arabic
   8. Maltese language
   9. Tunisian Arabic
5. Aramaic (Level 4)
   1. Syriac language
6. Berber languages (Level 4)
7. Egyptian language (Level 4)
   1. Coptic language
8. Hebrew language (Level 4)
   1. Modern Hebrew
9. Hausa language (Level 4)
10. Oromo language (Level 4)
11. Somali language (Level 4)
12. Tigrinya language

This section contains 2 articles.

1. Cree language
2. Ojibwe language

This section contains 20 articles.

1. Cebuano language (Level 4)
2. Chamorro language
3. Fijian language
4. Gilbertese language
5. Hawaiian language
6. Hiri Motu
7. Indonesian language (Level 4)
8. Javanese language (Level 4)
9. Madurese language
10. Malagasy language (Level 4)
11. Malay language (Level 3)
12. Māori language
13. Marshallese language
14. Samoan language
15. Sundanese language (Level 4)
16. Tagalog language (Level 4)
    1. Filipino language
17. Tahitian language
18. Tongan language
19. Tuvaluan language

This section contains 2 articles.

1. Khmer language (Level 4)
2. Vietnamese language (Level 4)

This section contains 3 articles.

1. Esperanto (Level 4)
2. Klingon language
3. Volapük

This section contains 4 articles.

1. Bislama
2. Haitian Creole
3. Sango language
4. Tok Pisin

This section contains 4 articles.

1. Kannada (Level 4)
2. Malayalam (Level 4)
3. Tamil language (Level 4)
4. Telugu language (Level 4)

This section contains 3 articles.

1. Greenlandic language
2. Inuktitut
3. Iñupiaq language

This section contains 111 articles.

This section contains 7 articles.

1. Albanian language
2. Armenian language (Level 4)
3. Greek language (Level 3)
   1. Ancient Greek (Level 4)
   2. Koine Greek
4. Hittite language
5. Proto-Indo-European language

This section contains 2 articles.

1. Latvian language
2. Lithuanian language

This section contains 5 articles.

1. Breton language
2. Cornish language
3. Irish language
4. Scottish Gaelic
5. Welsh language

This section contains 19 articles.

1. Assamese language (Level 4)
2. Bengali language (Level 3)
3. Bhojpuri language
4. Gujarati language (Level 4)
5. Hindustani language (Level 3)
   1. Hindi (Level 4)
   2. Urdu (Level 4)
6. Kashmiri language
7. Maithili language
8. Maldivian language
9. Marathi language (Level 4)
10. Nepali language (Level 4)
11. Odia language (Level 4)
12. Pali (Level 4)
13. Romani language
14. Sanskrit (Level 4)
15. Sindhi language (Level 4)
16. Sinhala language (Level 4)
17. Punjabi language (Level 4)

This section contains 30 articles.

1. Aragonese language
2. Catalan language
3. Corsican language
4. French language (Level 3)
   1. African French
   2. French of France
   3. Middle French
   4. Old French
   5. Quebec French
5. Galician language
6. Italian language (Level 4)
   1. Regional Italian
7. Latin (Level 3)
   1. Classical Latin
   2. Latin grammar
   3. Medieval Latin
   4. Neo-Latin
   5. Vulgar Latin
8. Occitan language
9. Portuguese language (Level 3)
   1. Brazilian Portuguese
10. Romanian language (Level 4)
11. Romansh language
12. Sardinian language
13. Spanish language (Level 3)
    1. Spanish language in the Americas
       1. Mexican Spanish
       2. Rioplatense Spanish
    2. Peninsular Spanish
14. Walloon language

This section contains 26 articles.

1. Afrikaans
2. Danish language (Level 4)
3. Dutch language (Level 4)
4. English language (Level 3)
   1. Old English (Level 4)
   2. Middle English (Level 4)
   3. Early Modern English
   4. Modern English (Level 4)
      1. American English
         1. African-American Vernacular English
      2. British English
      3. Indian English
   5. Scots language
5. Faroese language
6. German language (Level 3)
   1. High German languages
      1. Swiss German
   2. Low German
7. Gothic language
8. Icelandic language
9. Limburgish
10. Luxembourgish
11. Norwegian language
12. Swedish language (Level 4)
13. West Frisian language
14. Yiddish (Level 4)