moonfish vs horsehead

moonfish and horsehead both are nouns.

Word	Noun	Adjective	Verb	Adverb
moonfish	Yes	No	No	No
horsehead	Yes	No	No	No

As nouns, moonfish and horsehead are synonyms defined as:

moonfish and horsehead: any of several silvery marine fishes with very flat bodies

Other synonyms of moonfish include Atlantic moonfish, dollarfish, horse-head, horsefish, Selene setapinnis.

moonfish (noun)	horsehead (noun)
large elliptical brightly colored deep-sea fish of Atlantic and Pacific and Mediterranean	any of several silvery marine fishes with very flat bodies
any of several silvery marine fishes with very flat bodies