family Chaetodontidae vs Percomorphi

family Chaetodontidae and Percomorphi both are nouns.

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

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