order Perciformes vs Pomacentridae

order Perciformes and Pomacentridae both are nouns.

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

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