order Percomorphi vs Pomacentridae

order Percomorphi and Pomacentridae both are nouns.

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

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