coup de grâce vs ending

coup de grâce

noun
  • A remarkable finishing action. 

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

ending

noun
  • A termination or conclusion. 

  • The last part of something. 

  • The last morpheme of a word, added to some base to make an inflected form (such as -s in "dogs"). 

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