virtue vs chastity

virtue and chastity both are nouns.

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

As nouns, virtue and chastity are synonyms defined as:

Other synonyms of virtue include sexual morality.

virtue (noun)	chastity (noun)
the quality of doing what is right and avoiding what is wrong	abstaining from sexual relations (as because of religious vows)
morality with respect to sexual relations	morality with respect to sexual relations
any admirable quality or attribute
a particular moral excellence