cashew vs cashew nut

cashew and cashew nut both are nouns.

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

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

cashew (noun)	cashew nut (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