bitter orange vs bigarade

bitter orange and bigarade both are nouns.

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

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

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

Other synonyms of bitter orange include bitter orange tree, Citrus aurantium, marmalade orange, Seville orange, sour orange.

bitter 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