amphibolite vs metamorphic rock

amphibolite and metamorphic rock both are nouns.

Word	Noun	Adjective	Verb	Adverb
amphibolite	Yes	No	No	No
metamorphic rock	Yes	No	No	No

As nouns, metamorphic rock is a hypernym of amphibolite; that is, metamorphic rock is a word with a broader meaning than amphibolite:

amphibolite: a metamorphic rock composed chiefly of amphibole and plagioclase
metamorphic rock: rock altered by pressure and heat

amphibolite (noun)	metamorphic rock (noun)
a metamorphic rock composed chiefly of amphibole and plagioclase	rock altered by pressure and heat