fitness vs propriety

fitness

noun
  • The condition of being fit, suitable or appropriate. 

  • The condition of being attractive, fanciable or beautiful. 

  • The cultivation of an attractive and/or healthy physique. 

  • An organism's or species' degree of success in finding a mate and producing offspring. 

propriety

noun
  • Suitability, fitness; the quality of being appropriate. 

  • The fact of possessing something; ownership. 

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

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