sea chub vs percoidean

sea chub and percoidean both are nouns.

Word	Noun	Adjective	Verb	Adverb
sea chub	Yes	No	No	No
percoidean	Yes	No	No	No

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

sea chub: schooling fishes mostly of Indian and western Pacific oceans; two species in western Atlantic
percoidean: any of numerous spiny-finned fishes of the order Perciformes

Other hypernyms of sea chub include percoid, percoid fish.

sea chub (noun)	percoidean (noun)
schooling fishes mostly of Indian and western Pacific oceans; two species in western Atlantic	any of numerous spiny-finned fishes of the order Perciformes