ski lift vs chairlift

ski lift and chairlift both are nouns.

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

As nouns, chairlift is a hyponym of ski lift; that is, chairlift is a word with a more specific, narrower meaning than ski lift:

ski lift: a powered conveyance that carries skiers up a hill
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

Other hyponyms of ski lift include chair lift, rope tow, surface lift.

ski lift (noun)	chairlift (noun)
a powered conveyance that carries skiers up a hill	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