percoid fish vs order Percomorphi

percoid fish and order Percomorphi both are nouns.

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

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