chairlift vs ski lift

chairlift and ski lift both are nouns.

Word	Noun	Adjective	Verb	Adverb
chairlift	Yes	No	No	No
ski lift	Yes	No	No	No

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

chairlift: a ski lift on which riders (skiers or sightseers) are seated and carried up or down a mountainside; seats are hung from an endless overhead cable
ski lift: a powered conveyance that carries skiers up a hill

Other hypernyms of chairlift include lift, ski tow.

chairlift (noun)	ski lift (noun)
a ski lift on which riders (skiers or sightseers) are seated and carried up or down a mountainside; seats are hung from an endless overhead cable	a powered conveyance that carries skiers up a hill