closet vs kiosk

closet and kiosk both are nouns.

Word	Noun	Adjective	Verb	Adverb
closet	Yes	No	Yes	No
kiosk	Yes	No	No	No

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

Other hyponyms of closet include booth, cubicle, stall.

closet (noun)	kiosk (noun)
a small private room for study or prayer	small area set off by walls for special use
a toilet in Britain
a tall piece of furniture that provides storage space for clothes; has a door and rails or hooks for hanging clothes
a small room (or recess) or cabinet used for storage space

closet (verb)	kiosk (verb)
confine to a small space, as for intensive work