sea bream vs percoid fish

sea bream and percoid fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
sea bream	Yes	No	No	No
percoid fish	Yes	No	No	No

As nouns, percoid fish is a hypernym of sea bream; that is, percoid fish 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
percoid fish: any of numerous spiny-finned fishes of the order Perciformes

Other hypernyms of sea bream include percoid, percoidean.

sea bream (noun)	percoid fish (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