virtuous vs virtue

virtuous is not a noun while virtue is a noun.

Word	Noun	Adjective	Verb	Adverb
virtuous	No	Yes	No	No
virtue	Yes	No	No	No

virtuous (noun)	virtue (noun)
	the quality of doing what is right and avoiding what is wrong
	morality with respect to sexual relations
	any admirable quality or attribute
	a particular moral excellence

virtuous (adjective)	virtue (adjective)
morally excellent
in a state of sexual virginity