sweetsop tree vs custard apple

sweetsop tree and custard apple both are nouns.

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

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

sweetsop tree: tropical American tree bearing sweet pulpy fruit with thick scaly rind and shiny black seeds
custard apple: any of several tropical American trees bearing fruit with soft edible pulp

Other hypernyms of sweetsop tree include custard apple tree.

sweetsop tree (noun)	custard apple (noun)
tropical American tree bearing sweet pulpy fruit with thick scaly rind and shiny black seeds	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