sciaenid fish vs percoid fish

sciaenid fish and percoid fish both are nouns.

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

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

sciaenid fish: widely distributed family of carnivorous percoid fishes having a large air bladder used to produce sound
percoid fish: any of numerous spiny-finned fishes of the order Perciformes

Other hypernyms of sciaenid fish include percoid, percoidean.

sciaenid fish (noun)	percoid fish (noun)
widely distributed family of carnivorous percoid fishes having a large air bladder used to produce sound	any of numerous spiny-finned fishes of the order Perciformes