aristocrat vs viscount

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. 

viscount

noun
  • A member of the peerage, above a baron but below a count or earl. 

  • Any of various nymphalid butterflies of the genus Tanaecia. Other butterflies in this genus are called earls and counts. 

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