gentleman vs viscount

gentleman

noun
  • A man of gentle but not noble birth, particularly a man of means (originally ownership of property) who does not work for a living but has no official status in a peerage; (UK law) an armiferous man ranking below a knight. 

  • Any well-bred, well-mannered, or charming man. 

  • Any man. 

  • An amateur or dabbler in any field, particularly those of independent means. 

  • An amateur player, particularly one whose wealth permits him to forego payment. 

  • An effeminate or oversophisticated man. 

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 gentleman and viscount occurred in a corpus of books? (source: Google Ngram Viewer )