pond apple vs pond-apple tree

pond apple and pond-apple tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
pond apple	Yes	No	No	No
pond-apple tree	Yes	No	No	No

As nouns, pond apple and pond-apple tree are synonyms defined as:

pond apple and pond-apple tree: small evergreen tree of tropical America with edible fruit; used chiefly as grafting stock

Other synonyms of pond apple include Annona glabra.

pond apple (noun)	pond-apple tree (noun)
ovoid yellow fruit with very fragrant peach-colored flesh; related to custard apples	small evergreen tree of tropical America with edible fruit; used chiefly as grafting stock
small evergreen tree of tropical America with edible fruit; used chiefly as grafting stock