poacher vs scorpaenoid fish

poacher and scorpaenoid fish both are nouns.

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

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

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 poacher include scorpaenoid.

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
a cooking vessel designed to poach food (such as fish or eggs)
someone who hunts or fishes illegally on the property of another