nobility vs propriety

nobility

noun
  • A noble or privileged social class, historically accompanied by a hereditary title; aristocracy. 

  • The quality of being noble. 

propriety

noun
  • The fact of possessing something; ownership. 

  • Suitability, fitness; the quality of being appropriate. 

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

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