marmalade orange vs Citrus aurantium

marmalade orange and Citrus aurantium both are nouns.

Word	Noun	Adjective	Verb	Adverb
marmalade orange	Yes	No	No	No
Citrus aurantium	Yes	No	No	No

As nouns, marmalade orange and Citrus aurantium are synonyms defined as:

marmalade orange and Citrus aurantium: 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, Seville orange, sour orange.

marmalade orange (noun)	Citrus aurantium (noun)
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