croaker vs sciaenid fish

croaker and sciaenid fish both are nouns.

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

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

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

Other hypernyms of croaker include sciaenid.

croaker (noun)	sciaenid fish (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.