sea bream vs percoidean

sea bream and percoidean both are nouns.

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

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

sea bream: any of numerous marine percoid fishes especially (but not exclusively) of the family Sparidae
percoidean: any of numerous spiny-finned fishes of the order Perciformes

Other hypernyms of sea bream include percoid, percoid fish.

sea bream (noun)	percoidean (noun)
any of numerous marine percoid fishes especially (but not exclusively) of the family Sparidae	any of numerous spiny-finned fishes of the order Perciformes
flesh of any of various saltwater fishes of the family Sparidae or the family Bramidae