butterfish vs Pholis gunnellus

butterfish and Pholis gunnellus both are nouns.

Word	Noun	Adjective	Verb	Adverb
butterfish	Yes	No	No	No
Pholis gunnellus	Yes	No	No	No

As nouns, butterfish and Pholis gunnellus are synonyms defined as:

butterfish and Pholis gunnellus: slippery scaleless food fish of the northern Atlantic coastal waters

Other synonyms of butterfish include rock gunnel.

butterfish (noun)	Pholis gunnellus (noun)
small marine fish with a short compressed body and feeble spines	slippery scaleless food fish of the northern Atlantic coastal waters
slippery scaleless food fish of the northern Atlantic coastal waters
any of numerous small flat Atlantic food fish having smooth skin