sour orange vs bigarade

sour orange and bigarade both are nouns.

Word	Noun	Adjective	Verb	Adverb
sour orange	Yes	No	No	No
bigarade	Yes	No	No	No

As nouns, sour orange and bigarade are synonyms defined as:

sour orange and bigarade: any of various common orange trees yielding sour or bitter fruit; used as grafting stock

sour orange (noun)	bigarade (noun)
highly acidic orange used especially in marmalade	any of various common orange trees yielding sour or bitter fruit; used as grafting stock
any of various common orange trees yielding sour or bitter fruit; used as grafting stock