virtue vs virtuousness

virtue and virtuousness both are nouns.

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

As nouns, virtue and virtuousness are synonyms defined as:

virtue and virtuousness: the quality of doing what is right and avoiding what is wrong

Other synonyms of virtue include moral excellence.

virtue (noun)	virtuousness (noun)
the quality of doing what is right and avoiding what is wrong	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