percoidean vs percoid fish

percoidean and percoid fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
percoidean	Yes	No	No	No
percoid fish	Yes	No	No	No

As nouns, percoidean and percoid fish are synonyms defined as:

percoidean and percoid fish: any of numerous spiny-finned fishes of the order Perciformes

Other synonyms of percoidean include percoid.

percoidean (noun)	percoid fish (noun)
any of numerous spiny-finned fishes of the order Perciformes	any of numerous spiny-finned fishes of the order Perciformes