ski wax vs wax

ski wax and wax both are nouns.

Word	Noun	Adjective	Verb	Adverb
ski wax	Yes	No	No	No
wax	Yes	No	Yes	No

As nouns, wax is a hypernym of ski wax; that is, wax is a word with a broader meaning than ski wax:

ski wax: wax used on the bottom of skis
wax: any of various substances of either mineral origin or plant or animal origin; they are solid at normal temperatures and insoluble in water

ski wax (noun)	wax (noun)
wax used on the bottom of skis	any of various substances of either mineral origin or plant or animal origin; they are solid at normal temperatures and insoluble in water