iconoclasm vs piety

iconoclasm

noun
  • The belief in, participation in, or sanction of destroying religious icons and other symbols or monuments, usually with religious or political motives. 

piety

noun
  • Reverence and devotion to God. 

  • A devout act or thought. 

  • A belief that is accepted unthinkingly and with undue reverence. 

  • Similar reverence to one's parents and family or to one's country. 

How often have the words iconoclasm and piety occurred in a corpus of books? (source: Google Ngram Viewer )