white walnut vs butternut

white walnut and butternut both are nouns.

Word	Noun	Adjective	Verb	Adverb
white walnut	Yes	No	No	No
butternut	Yes	No	No	No

As nouns, white walnut and butternut are synonyms defined as:

white walnut and butternut: North American walnut tree having light-brown wood and edible nuts; source of a light-brown dye

Other synonyms of white walnut include butternut tree, Juglans cinerea.

white walnut (noun)	butternut (noun)
North American walnut tree having light-brown wood and edible nuts; source of a light-brown dye	oily egg-shaped nut of an American tree of the walnut family
	North American walnut tree having light-brown wood and edible nuts; source of a light-brown dye