Jamaica apple vs custard apple

Jamaica apple and custard apple both are nouns.

Word	Noun	Adjective	Verb	Adverb
Jamaica apple	Yes	No	No	No
custard apple	Yes	No	No	No

As nouns, custard apple is a hypernym of Jamaica apple; that is, custard apple is a word with a broader meaning than Jamaica apple:

Jamaica apple: large heart-shaped tropical fruit with soft acid pulp
custard apple: the fruit of any of several tropical American trees of the genus Annona having soft edible pulp

Jamaica apple (noun)	custard apple (noun)
large heart-shaped tropical fruit with soft acid pulp	the fruit of any of several tropical American trees of the genus Annona having soft edible pulp
	any of several tropical American trees bearing fruit with soft edible pulp