propriety vs recommendability

propriety

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

  • The fact of possessing something; ownership. 

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

recommendability

noun
  • The quality of being recommendable. 

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