Seville orange vs bigarade

Seville orange and bigarade both are nouns.

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

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

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

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

Seville 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