Citrus aurantium vs sour orange

Citrus aurantium and sour orange both are nouns.

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

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

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

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

Citrus aurantium (noun)	sour 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