surf fish vs percoidean

surf fish and percoidean both are nouns.

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

As nouns, percoidean is a hypernym of surf fish; that is, percoidean is a word with a broader meaning than surf fish:

surf fish: small to medium-sized shallow-water fishes of the Pacific coast of North America
percoidean: any of numerous spiny-finned fishes of the order Perciformes

Other hypernyms of surf fish include percoid, percoid fish.

surf fish (noun)	percoidean (noun)
small to medium-sized shallow-water fishes of the Pacific coast of North America	any of numerous spiny-finned fishes of the order Perciformes
a fish of the Pacific coast of North America