surfperch vs percoid fish

surfperch and percoid fish both are nouns.

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

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

surfperch: 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 surfperch include percoid, percoidean.

surfperch (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