Puritan vs pious

Puritan

noun
  • A member of a particular Protestant religious sect advocating greater purity and piety. 

pious

adj
  • Relating to religion or religious works. 

  • Of or pertaining to piety, exhibiting piety, devout, godfearing. 

  • Insisting on or making a show of one's own virtue, especially in comparison to others; sanctimonious, condescending, judgmental. 

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