Seville orange vs marmalade orange

Seville orange and marmalade orange both are nouns.

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

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

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

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

Seville orange (noun)	marmalade orange (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