custard apple vs custard apple tree

custard apple and custard apple tree both are nouns.

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

As nouns, custard apple and custard apple tree are synonyms defined as:

custard apple and custard apple tree: any of several tropical American trees bearing fruit with soft edible pulp

custard apple (noun)	custard apple tree (noun)
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
any of several tropical American trees bearing fruit with soft edible pulp