mutton snapper vs muttonfish

mutton snapper and muttonfish both are nouns.

Word	Noun	Adjective	Verb	Adverb
mutton snapper	Yes	No	No	No
muttonfish	Yes	No	No	No

As nouns, mutton snapper and muttonfish are synonyms defined as:

mutton snapper and muttonfish: similar to and often marketed as `red snapper'

Other synonyms of mutton snapper include Lutjanus analis.

mutton snapper (noun)	muttonfish (noun)
similar to and often marketed as `red snapper'	similar to and often marketed as `red snapper'