diachrony vs linguistics

diachrony and linguistics both are nouns.

Word	Noun	Adjective	Verb	Adverb
diachrony	Yes	No	No	No
linguistics	Yes	No	No	No

As nouns, linguistics is a hypernym of diachrony; that is, linguistics is a word with a broader meaning than diachrony:

diachrony (noun)	linguistics (noun)
the study of linguistic change	the scientific study of language
	the humanistic study of language and literature