order Perciformes vs Gerreidae

order Perciformes and Gerreidae both are nouns.

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

order Perciformes (noun)	Gerreidae (noun)
one of the largest natural groups of fishes of both marine and fresh water: true perches, basses, tuna	mojarras