family Pomacentridae vs order Percomorphi

family Pomacentridae and order Percomorphi both are nouns.

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

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