conventionality vs propriety

conventionality

noun
  • The state of being conventional 

  • Something conventional; a convention 

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 conventionality and propriety occurred in a corpus of books? (source: Google Ngram Viewer )