bullock's heart vs Jamaica apple

bullock's heart and Jamaica apple both are nouns.

Word	Noun	Adjective	Verb	Adverb
bullock's heart	Yes	No	No	No
Jamaica apple	Yes	No	No	No

As nouns, bullock's heart and Jamaica apple are synonyms defined as:

bullock's heart and Jamaica apple: large heart-shaped tropical fruit with soft acid pulp

bullock's heart (noun)	Jamaica apple (noun)
large heart-shaped tropical fruit with soft acid pulp	large heart-shaped tropical fruit with soft acid pulp
small tropical American tree bearing a bristly heart-shaped acid tropical fruit