croaker vs sciaenid

croaker and sciaenid both are nouns.

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

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

croaker: any of several fishes that make a croaking noise
sciaenid: widely distributed family of carnivorous percoid fishes having a large air bladder used to produce sound

Other hypernyms of croaker include sciaenid fish.

croaker (noun)	sciaenid (noun)
any of several fishes that make a croaking noise	widely distributed family of carnivorous percoid fishes having a large air bladder used to produce sound
the lean flesh of a saltwater fish caught along Atlantic coast of southern U.S.