cashew nut vs cashew

cashew nut and cashew both are nouns.

Word	Noun	Adjective	Verb	Adverb
cashew nut	Yes	No	No	No
cashew	Yes	No	No	No

As nouns, cashew nut and cashew are synonyms defined as:

cashew nut (noun)	cashew (noun)
kidney-shaped nut edible only when roasted	kidney-shaped nut edible only when roasted
	tropical American evergreen tree bearing kidney-shaped nuts that are edible only when roasted