sciaenid vs percoidean

sciaenid and percoidean both are nouns.

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

As nouns, percoidean is a hypernym of sciaenid; that is, percoidean 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
percoidean: any of numerous spiny-finned fishes of the order Perciformes

Other hypernyms of sciaenid include percoid, percoid fish.

sciaenid (noun)	percoidean (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