Citrus maxima vs pomelo

Citrus maxima and pomelo both are nouns.

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

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

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

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

Citrus maxima (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