oysterfish vs Opsanus tau

oysterfish and Opsanus tau both are nouns.

Word	Noun	Adjective	Verb	Adverb
oysterfish	Yes	No	No	No
Opsanus tau	Yes	No	No	No

As nouns, Opsanus tau is a hypernym of oysterfish; that is, Opsanus tau is a word with a broader meaning than oysterfish:

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

Other hypernyms of oysterfish include toadfish.

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