pomelo tree vs pomelo

pomelo tree and pomelo both are nouns.

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

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

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

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

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