order Percomorphi vs percoid fish

order Percomorphi and percoid fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
order Percomorphi	Yes	No	No	No
percoid fish	Yes	No	No	No

order Percomorphi (noun)	percoid fish (noun)
one of the largest natural groups of fishes of both marine and fresh water: true perches, basses, tuna	any of numerous spiny-finned fishes of the order Perciformes