percoid vs percoidean

percoid and percoidean both are nouns.

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

As nouns, percoid and percoidean are synonyms defined as:

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

Other synonyms of percoid include percoid fish.

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