Citrus maxima vs Citrus grandis

Citrus maxima and Citrus grandis both are nouns.

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

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

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

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

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