kola nut vs kola

kola nut and kola both are nouns.

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

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

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

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

kola nut (noun)	kola (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