black cherry vs sweet cherry

black cherry and sweet cherry both are nouns.

Word	Noun	Adjective	Verb	Adverb
black cherry	Yes	No	No	No
sweet cherry	Yes	No	No	No

As nouns, black cherry and sweet cherry are synonyms defined as:

black cherry and sweet cherry: any of several fruits of cultivated cherry trees that have sweet flesh

black cherry (noun)	sweet cherry (noun)
any of several fruits of cultivated cherry trees that have sweet flesh	any of several fruits of cultivated cherry trees that have sweet flesh
large North American wild cherry with round black sour edible fruit	large Eurasian tree producing small dark bitter fruit in the wild but edible sweet fruit under cultivation