virtue vs purity

virtue and purity both are nouns.

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

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

Other hyponyms of virtue include honor, honour, pureness.

virtue (noun)	purity (noun)
the quality of doing what is right and avoiding what is wrong	a woman's virtue or chastity
morality with respect to sexual relations	being undiluted or unmixed with extraneous material
any admirable quality or attribute	the state of being unsullied by sin or moral wrong; lacking a knowledge of evil
a particular moral excellence