sciaenid vs percoid

sciaenid and percoid both are nouns.

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

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

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

Other hypernyms of sciaenid include percoid fish, percoidean.

sciaenid (noun)	percoid (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