cognition brain historical linguistics grammar cross-cultural communication language and thought alphabet ambiguity endangered languages computational linguistics colonialism dictionary corpus linguistics accent code consonants conversation analysis cooperative principle evolution contact language code-switching comparative method cognates child language acquisition britain ai language linguistic diversity biolinguistics discourse analysis ancient rome anatomy identity articulation chatbot ancient greece aphasia linguistic relativity china bouba/kiki effect implicature abjad ethics grice's maxims color perception psycholinguistics crime dialect critical period hypothesis astronomy animal communication accessibility areal linguistics asl morphology Sapir-Whorf hypothesis field linguistics blame forensic linguistics central asia broca's area authorship analysis stereotypes phonology argot communication accommodation theory euphemism deaf culture conlang advertising indo-european languages branding indigenous rights ampersand legal language agglutination