toadfish vs oysterfish

toadfish and oysterfish both are nouns.

Word	Noun	Adjective	Verb	Adverb
toadfish	Yes	No	No	No
oysterfish	Yes	No	No	No

As nouns, oysterfish is a hyponym of toadfish; that is, oysterfish is a word with a more specific, narrower meaning than toadfish:

toadfish: bottom-dwelling fish having scaleless slimy skin and a broad thick head with a wide mouth
oysterfish: a variety of toadfish

Other hyponyms of toadfish include oyster-fish, oyster fish.

toadfish (noun)	oysterfish (noun)
bottom-dwelling fish having scaleless slimy skin and a broad thick head with a wide mouth	a variety of toadfish