horsehead vs Atlantic moonfish

horsehead and Atlantic moonfish both are nouns.

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

As nouns, horsehead and Atlantic moonfish are synonyms defined as:

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

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

horsehead (noun)	Atlantic moonfish (noun)
any of several silvery marine fishes with very flat bodies	any of several silvery marine fishes with very flat bodies