pomelo vs Citrus maxima

pomelo and Citrus maxima both are nouns.

Word	Noun	Adjective	Verb	Adverb
pomelo	Yes	No	No	No
Citrus maxima	Yes	No	No	No

As nouns, pomelo and Citrus maxima are synonyms defined as:

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

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

pomelo (noun)	Citrus maxima (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