sea trout vs sciaenid

sea trout and sciaenid both are nouns.

Word	Noun	Adjective	Verb	Adverb
sea trout	Yes	No	No	No
sciaenid	Yes	No	No	No

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

sea trout: any of several sciaenid fishes of North American coastal waters
sciaenid: widely distributed family of carnivorous percoid fishes having a large air bladder used to produce sound

Other hypernyms of sea trout include sciaenid fish.

sea trout (noun)	sciaenid (noun)
silvery marine variety of brown trout that migrates to fresh water to spawn	widely distributed family of carnivorous percoid fishes having a large air bladder used to produce sound
any of several sciaenid fishes of North American coastal waters
flesh of marine trout that migrate from salt to fresh water