blackheart vs heart cherry

blackheart and heart cherry both are nouns.

Word	Noun	Adjective	Verb	Adverb
blackheart	Yes	No	No	No
heart cherry	Yes	No	No	No

As nouns, heart cherry is a hypernym of blackheart; that is, heart cherry is a word with a broader meaning than blackheart:

Other hypernyms of blackheart include oxheart, oxheart cherry.

blackheart (noun)	heart cherry (noun)
heart cherry with dark flesh and skin	large heart-shaped sweet cherry with soft flesh
any of various diseases in which the central tissues blacken	any of several cultivated sweet cherries having sweet juicy heart-shaped fruits