Coryphaena hippurus vs mahimahi

Coryphaena hippurus and mahimahi both are nouns.

Word	Noun	Adjective	Verb	Adverb
Coryphaena hippurus	Yes	No	No	No
mahimahi	Yes	No	No	No

As nouns, mahimahi is a hypernym of Coryphaena hippurus; that is, mahimahi is a word with a broader meaning than Coryphaena hippurus:

Coryphaena hippurus: the more common dolphinfish valued as food; about six feet long
mahimahi: large slender food and game fish widely distributed in warm seas (especially around Hawaii)

Other hypernyms of Coryphaena hippurus include dolphin, dolphinfish.

Coryphaena hippurus (noun)	mahimahi (noun)
the more common dolphinfish valued as food; about six feet long	large slender food and game fish widely distributed in warm seas (especially around Hawaii)
	the lean flesh of a saltwater fish found in warm waters (especially in Hawaii)