vanity vs vain

vanity is a noun but vain is not a noun.

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

vanity (noun)	vain (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

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