black bream vs sea bream

black bream and sea bream both are nouns.

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

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

black bream: important dark-colored edible food and game fish of Australia
sea bream: any of numerous marine percoid fishes especially (but not exclusively) of the family Sparidae

Other hypernyms of black bream include bream.

black bream (noun)	sea bream (noun)
important dark-colored edible food and game fish of Australia	any of numerous marine percoid fishes especially (but not exclusively) of the family Sparidae
	flesh of any of various saltwater fishes of the family Sparidae or the family Bramidae