nut vs kola nut

nut and kola nut both are nouns.

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

As nouns, kola nut is a hyponym of nut; that is, kola nut is a word with a more specific, narrower meaning than nut:

Other hyponyms of nut include edible nut, cedar nut, cembra nut, cola nut, mast, palm kernel, palm nut, nutlet.

nut (noun)	kola nut (noun)
a small (usually square or hexagonal) metal block with internal screw thread to be fitted onto a bolt	tree bearing large brown nuts containing e.g. caffeine; source of cola extract
one of the two male reproductive glands that produce spermatozoa and secrete androgens	bitter brown seed containing caffein; source of cola extract
someone who is so ardently devoted to something that it resembles an addiction
a whimsically eccentric person
usually large hard-shelled seed
half the width of an em

nut (verb)	kola nut (verb)
gather nuts