vain vs vanity

vain is not a noun while vanity is a noun.

Word	Noun	Adjective	Verb	Adverb
vain	No	Yes	No	No
vanity	Yes	No	No	No

vain (noun)	vanity (noun)
	low table with mirror or mirrors where one sits while dressing or applying makeup
	the trait of being unduly vain and conceited; false pride
	the quality of being valueless or futile
	feelings of excessive pride

vain (adjective)	vanity (adjective)
characteristic of false pride; having an exaggerated sense of self-importance
unproductive of success