closet vs shelf

closet and shelf both are nouns.

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

closet (noun)	shelf (noun)
a small private room for study or prayer	a support that consists of a horizontal surface for holding objects
a toilet in Britain	a projecting ridge on a mountain or submerged under water
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)	shelf (verb)
confine to a small space, as for intensive work