moonfish vs opah

moonfish and opah both are nouns.

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

As nouns, moonfish and opah are synonyms defined as:

moonfish and opah: large elliptical brightly colored deep-sea fish of Atlantic and Pacific and Mediterranean

Other synonyms of moonfish include Lampris regius.

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