polling booth vs kiosk

polling booth and kiosk both are nouns.

Word	Noun	Adjective	Verb	Adverb
polling booth	Yes	No	No	No
kiosk	Yes	No	No	No

As nouns, kiosk is a hypernym of polling booth; that is, kiosk is a word with a broader meaning than polling booth:

polling booth: a temporary booth in a polling place which people enter to cast their votes
kiosk: small area set off by walls for special use

Other hypernyms of polling booth include booth, cubicle, stall.

polling booth (noun)	kiosk (noun)
a temporary booth in a polling place which people enter to cast their votes	small area set off by walls for special use