surf fish vs percoid fish

surf fish and percoid fish both are nouns.

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

As nouns, percoid fish is a hypernym of surf fish; that is, percoid fish 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
percoid fish: any of numerous spiny-finned fishes of the order Perciformes

Other hypernyms of surf fish include percoid, percoidean.

surf fish (noun)	percoid fish (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