percoidean vs order Percomorphi

percoidean and order Percomorphi both are nouns.

Word	Noun	Adjective	Verb	Adverb
percoidean	Yes	No	No	No
order Percomorphi	Yes	No	No	No

percoidean (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