kola nut vs cola nut

kola nut and cola nut both are nouns.

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

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

kola nut and cola nut: bitter brown seed containing caffein; source of cola extract

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