mojarra vs percoidean

mojarra and percoidean both are nouns.

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

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

mojarra: small silvery schooling fishes with protrusible mouths found in warm coastal waters
percoidean: any of numerous spiny-finned fishes of the order Perciformes

Other hypernyms of mojarra include percoid, percoid fish.

mojarra (noun)	percoidean (noun)
small silvery schooling fishes with protrusible mouths found in warm coastal waters	any of numerous spiny-finned fishes of the order Perciformes