order Perciformes vs family Acanthuridae

order Perciformes and family Acanthuridae both are nouns.

Word	Noun	Adjective	Verb	Adverb
order Perciformes	Yes	No	No	No
family Acanthuridae	Yes	No	No	No

order Perciformes (noun)	family Acanthuridae (noun)
one of the largest natural groups of fishes of both marine and fresh water: true perches, basses, tuna	surgeonfishes