macadamia nut vs macadamia nut tree

macadamia nut and macadamia nut tree both are nouns.

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

As nouns, macadamia nut and macadamia nut tree are synonyms defined as:

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

Other synonyms of macadamia nut include Macadamia ternifolia.

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