oxheart vs black cherry

oxheart and black cherry both are nouns.

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

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

oxheart: large heart-shaped sweet cherry with soft flesh
black cherry: any of several fruits of cultivated cherry trees that have sweet flesh

Other hypernyms of oxheart include sweet cherry.

oxheart (noun)	black cherry (noun)
large heart-shaped sweet cherry with soft flesh	any of several fruits of cultivated cherry trees that have sweet flesh
any of several cultivated sweet cherries having sweet juicy heart-shaped fruits	large North American wild cherry with round black sour edible fruit