politesse vs propriety

politesse

noun
  • Civility, politeness, courtesy or gallantry; or an instance of this. 

propriety

noun
  • Correctness in behaviour and morals; good manners, seemliness. 

  • The fact of possessing something; ownership. 

  • Suitability, fitness; the quality of being appropriate. 

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