order Perciformes vs Branchiostegidae

order Perciformes and Branchiostegidae both are nouns.

Word	Noun	Adjective	Verb	Adverb
order Perciformes	Yes	No	No	No
Branchiostegidae	Yes	No	No	No

order Perciformes (noun)	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