order Perciformes vs percoid fish

order Perciformes and percoid fish both are nouns.

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

order Perciformes (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