mahimahi vs percoidean

mahimahi and percoidean both are nouns.

Word	Noun	Adjective	Verb	Adverb
mahimahi	Yes	No	No	No
percoidean	Yes	No	No	No

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

mahimahi: large slender food and game fish widely distributed in warm seas (especially around Hawaii)
percoidean: any of numerous spiny-finned fishes of the order Perciformes

Other hypernyms of mahimahi include percoid, percoid fish.

mahimahi (noun)	percoidean (noun)
large slender food and game fish widely distributed in warm seas (especially around Hawaii)	any of numerous spiny-finned fishes of the order Perciformes
the lean flesh of a saltwater fish found in warm waters (especially in Hawaii)