concepts vocabulary

colloquialism
dialect
diction
etymology
grammar (mental, universal, descriptive, and prescriptive grammars)
idiolect
idiom
IPA
jargon
language
language family
lexicon (lexis)
linguistics (historical linguistics, anthropological linguistics,
                      psycholinguistics, sociolinguistics, applied linguistics,
                      neurocognitive linguistics)

meter
morpheme
morphology
phoneme
phonetic alphabet
phonetics
phonology
rhetoric
rhyme
semantics
semiology
sign
slang
syllable
syntax
word