Difference between Sanctimoniousness and Sanctimony

What is the difference between Sanctimoniousness and Sanctimony?

Sanctimoniousness as a noun is the property of being sanctimonious. while Sanctimony as a noun is a hypocritical form of excessive piety, considered to be an affectation merely for public show.

We hope you now know whether to use Sanctimoniousness or Sanctimony in your sentence.