marmalade orange vs Seville orange

marmalade orange and Seville orange both are nouns.

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

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

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

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

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