Jack Ketch vs hangman

Jack Ketch

noun
  • the gallows 

  • death 

  • a public executioner 

  • the devil 

hangman

noun
  • Someone responsible for hanging pictures and other artworks in a gallery, museum etc. 

  • An executioner responsible for hanging criminals. 

  • A guessing game where one has to guess the word an opponent is thinking of by guessing one letter at a time, and involving the gradual drawing of a stick figure hanging from the gallows. 

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