Citrus maxima vs shaddock

Citrus maxima and shaddock both are nouns.

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

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

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

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

Citrus maxima (noun)	shaddock (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