sour orange vs marmalade orange

sour orange and marmalade orange both are nouns.

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

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

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

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

sour 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