firing squad vs hangman

firing squad

noun
  • A group of soldiers or paramilitaries detailed to execute someone, usually by rifle shot, or to discharge their weapons ceremonially at a funeral. 

hangman

noun
  • An executioner responsible for hanging criminals. 

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

  • 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 firing squad and hangman occurred in a corpus of books? (source: Google Ngram Viewer )