pomelo vs pomelo tree

pomelo and pomelo tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
pomelo	Yes	No	No	No
pomelo tree	Yes	No	No	No

As nouns, pomelo and pomelo tree are synonyms defined as:

pomelo and pomelo tree: southeastern Asian tree producing large fruits resembling grapefruits

Other synonyms of pomelo include Citrus decumana, Citrus grandis, Citrus maxima, pummelo, shaddock.

pomelo (noun)	pomelo tree (noun)
large pear-shaped fruit similar to grapefruit but with coarse dry pulp	southeastern Asian tree producing large fruits resembling grapefruits
southeastern Asian tree producing large fruits resembling grapefruits