dollarfish vs butterfish

dollarfish and butterfish both are nouns.

Word	Noun	Adjective	Verb	Adverb
dollarfish	Yes	No	No	No
butterfish	Yes	No	No	No

As nouns, butterfish is a hypernym of dollarfish; that is, butterfish is a word with a broader meaning than dollarfish:

dollarfish: small food fish of Atlantic coast
butterfish: small marine fish with a short compressed body and feeble spines

Other hypernyms of dollarfish include stromateid, stromateid fish.

dollarfish (noun)	butterfish (noun)
small food fish of Atlantic coast	small marine fish with a short compressed body and feeble spines
any of several silvery marine fishes with very flat bodies	slippery scaleless food fish of the northern Atlantic coastal waters
	any of numerous small flat Atlantic food fish having smooth skin