Citrus decumana vs pummelo

Citrus decumana and pummelo both are nouns.

Word	Noun	Adjective	Verb	Adverb
Citrus decumana	Yes	No	No	No
pummelo	Yes	No	No	No

As nouns, Citrus decumana and pummelo are synonyms defined as:

Citrus decumana and pummelo: southeastern Asian tree producing large fruits resembling grapefruits

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

Citrus decumana (noun)	pummelo (noun)
southeastern Asian tree producing large fruits resembling grapefruits	southeastern Asian tree producing large fruits resembling grapefruits