black cherry vs rum cherry

black cherry and rum cherry both are nouns.

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

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

black cherry and rum cherry: large North American wild cherry with round black sour edible fruit

Other synonyms of black cherry include black cherry tree, Prunus serotina.

black cherry (noun)	rum cherry (noun)
any of several fruits of cultivated cherry trees that have sweet flesh	large North American wild cherry with round black sour edible fruit
large North American wild cherry with round black sour edible fruit