toadfish vs oyster-fish

toadfish and oyster-fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
toadfish	Yes	No	No	No
oyster-fish	Yes	No	No	No

As nouns, oyster-fish is a hyponym of toadfish; that is, oyster-fish 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
oyster-fish: a variety of toadfish

Other hyponyms of toadfish include oyster fish, oysterfish.

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