kola nut tree vs kola nut

kola nut tree and kola nut both are nouns.

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

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

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

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

kola nut tree (noun)	kola nut (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