Sir vs aristocrat

Sir

noun
  • The titular prefix given to a knight or baronet. 

aristocrat

noun
  • One of the aristocracy, nobility, or people of rank in a community; one of a ruling class; a noble (originally in Revolutionary France). 

  • A proponent of aristocracy; an advocate of aristocratic government. 

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