coup de grâce vs killing

coup de grâce

noun
  • A final blow or shot given to kill a wounded person or animal. 

  • A remarkable finishing action. 

killing

noun
  • An instance of someone being killed. 

  • A large amount of money. 

adj
  • That makes one ‘die’ with laughter; very funny. 

  • That literally deprives of life; lethal, deadly, fatal. 

How often have the words coup de grâce and killing occurred in a corpus of books? (source: Google Ngram Viewer )