Percomorphi vs family Branchiostegidae

Percomorphi and family Branchiostegidae both are nouns.

Word	Noun	Adjective	Verb	Adverb
Percomorphi	Yes	No	No	No
family Branchiostegidae	Yes	No	No	No

Percomorphi (noun)	family Branchiostegidae (noun)
one of the largest natural groups of fishes of both marine and fresh water: true perches, basses, tuna	small family of marine fishes having covered gills