custard apple tree vs custard apple

custard apple tree and custard apple both are nouns.

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

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

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

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