order Perciformes vs family Pomacentridae

order Perciformes and family Pomacentridae both are nouns.

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

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