kola nut vs kola nut tree

kola nut and kola nut tree both are nouns.

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

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

kola nut and kola nut tree: tree bearing large brown nuts containing e.g. caffeine; source of cola extract

Other synonyms of kola nut include Cola acuminata, goora nut, kola.

kola nut (noun)	kola nut tree (noun)
tree bearing large brown nuts containing e.g. caffeine; source of cola extract	tree bearing large brown nuts containing e.g. caffeine; source of cola extract
bitter brown seed containing caffein; source of cola extract