horse-head vs moonfish

horse-head and moonfish both are nouns.

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

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

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

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

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