Citrus grandis vs Citrus maxima

Citrus grandis and Citrus maxima both are nouns.

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

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

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

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

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