soursop tree vs custard apple

soursop tree and custard apple both are nouns.

Word	Noun	Adjective	Verb	Adverb
soursop tree	Yes	No	No	No
custard apple	Yes	No	No	No

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

soursop tree: small tropical American tree bearing large succulent slightly acid fruit
custard apple: any of several tropical American trees bearing fruit with soft edible pulp

Other hypernyms of soursop tree include custard apple tree.

soursop tree (noun)	custard apple (noun)
small tropical American tree bearing large succulent slightly acid fruit	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