toilet vs closet

toilet and closet both are nouns.

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

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

toilet (noun)	closet (noun)
the act of dressing and preparing yourself	a small private room for study or prayer
a room or building equipped with one or more toilets	a toilet in Britain
a plumbing fixture for defecation and urination	a tall piece of furniture that provides storage space for clothes; has a door and rails or hooks for hanging clothes
misfortune resulting in lost effort or money	a small room (or recess) or cabinet used for storage space

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