bitter orange vs orange

bitter orange and orange both are nouns.

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

As nouns, orange is a hypernym of bitter orange; that is, orange is a word with a broader meaning than bitter orange:

As nouns, orange is a hypernym of bitter orange; that is, orange is a word with a broader meaning than bitter orange:

bitter orange: any of various common orange trees yielding sour or bitter fruit; used as grafting stock
orange: any citrus tree bearing oranges

Other hypernyms of bitter orange include orange tree.

bitter orange (noun)	orange (noun)
highly acidic orange used especially in marmalade	orange color or pigment; any of a range of colors between red and yellow
any of various common orange trees yielding sour or bitter fruit; used as grafting stock	round yellow to orange fruit of any of several citrus trees
	any citrus tree bearing oranges
	any pigment producing the orange color

bitter orange (adjective)	orange (adjective)
	of the color between red and yellow; similar to the color of a ripe orange