Citrus decumana vs Citrus maxima

Citrus decumana and Citrus maxima both are nouns.

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

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

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

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

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