oyster fish vs toadfish

oyster fish and toadfish both are nouns.

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

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

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

Other hypernyms of oyster fish include Opsanus tau.

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