sea poacher vs scorpaenoid fish

sea poacher and scorpaenoid fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
sea poacher	Yes	No	No	No
scorpaenoid fish	Yes	No	No	No

As nouns, scorpaenoid fish is a hypernym of sea poacher; that is, scorpaenoid fish is a word with a broader meaning than sea poacher:

sea poacher: small slender fish (to 8 inches) with body covered by bony plates; chiefly of deeper northern Pacific waters
scorpaenoid fish: fishes having the head armored with bony plates

Other hypernyms of sea poacher include scorpaenoid.

sea poacher (noun)	scorpaenoid fish (noun)
small slender fish (to 8 inches) with body covered by bony plates; chiefly of deeper northern Pacific waters	fishes having the head armored with bony plates