propriety vs punctilio

propriety

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

  • The fact of possessing something; ownership. 

  • Suitability, fitness; the quality of being appropriate. 

punctilio

noun
  • A fine point in exactness of conduct, ceremony or procedure. Strictness in observance of formalities. 

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