macadamia nut vs macadamia

macadamia nut and macadamia both are nouns.

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

As nouns, macadamia is a hypernym of macadamia nut; that is, macadamia is a word with a broader meaning than macadamia nut:

macadamia nut: small Australian tree with racemes of pink flowers; widely cultivated (especially in Hawaii) for its sweet edible nuts
macadamia: any tree of the genus Macadamia

Other hypernyms of macadamia nut include macadamia tree.

macadamia nut (noun)	macadamia (noun)
nutlike seed with sweet and crisp white meat	any tree of the genus Macadamia
small Australian tree with racemes of pink flowers; widely cultivated (especially in Hawaii) for its sweet edible nuts