family Branchiostegidae vs Percomorphi

family Branchiostegidae and Percomorphi both are nouns.

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

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