lesbian vs butch

lesbian and butch both are nouns.

Word	Noun	Adjective	Verb	Adverb
lesbian	Yes	Yes	No	No
butch	Yes	Yes	No	No

As nouns, butch is a hyponym of lesbian; that is, butch is a word with a more specific, narrower meaning than lesbian:

Other hyponyms of lesbian include dike, dyke.

lesbian (noun)	butch (noun)
a female homosexual	a closely cropped haircut; usually for men or boys
	(slang) offensive term for a lesbian who is noticeably masculine

lesbian (adjective)	butch (adjective)
of or relating to or characterized by homosexual relations between woman	(of male or female homosexuals) characterized by stereotypically male traits or appearance
	used of men; markedly masculine in appearance or manner