shelf vs closet

shelf and closet both are nouns.

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

shelf (noun)	closet (noun)
a support that consists of a horizontal surface for holding objects	a small private room for study or prayer
a projecting ridge on a mountain or submerged under water	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

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