horse-head vs Atlantic moonfish

horse-head and Atlantic moonfish both are nouns.

Word	Noun	Adjective	Verb	Adverb
horse-head	Yes	No	No	No
Atlantic moonfish	Yes	No	No	No

As nouns, horse-head and Atlantic moonfish are synonyms defined as:

horse-head and Atlantic moonfish: any of several silvery marine fishes with very flat bodies

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

horse-head (noun)	Atlantic moonfish (noun)
any of several silvery marine fishes with very flat bodies	any of several silvery marine fishes with very flat bodies