sour orange vs bitter orange

sour orange and bitter orange both are nouns.

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

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

sour orange and bitter orange: highly acidic orange used especially in marmalade

Other synonyms of sour orange include Seville orange.

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

sour orange and bitter 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 tree, Citrus aurantium, marmalade orange, Seville orange.

sour orange (noun)	bitter orange (noun)
highly acidic orange used especially in marmalade	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