silver perch vs serranid fish

silver perch and serranid fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
silver perch	Yes	No	No	No
serranid fish	Yes	No	No	No

As nouns, serranid fish is a hypernym of silver perch; that is, serranid fish is a word with a broader meaning than silver perch:

silver perch: small silvery food and game fish of eastern United States streams
serranid fish: marine food sport fishes mainly of warm coastal waters

Other hypernyms of silver perch include serranid.

silver perch (noun)	serranid fish (noun)
small silvery food and game fish of eastern United States streams	marine food sport fishes mainly of warm coastal waters
small silvery drumfish often mistaken for white perch; found along coasts of United States from New York to Mexico