abattoir vs butcher's hook

abattoir

noun
  • A place or event likened to a slaughterhouse, because of great carnage or bloodshed. 

  • A public slaughterhouse for cattle, sheep, etc. 

butcher's hook

noun
  • Synonym of butcher's 

  • A hook used by a butcher for hanging carcasses or meat. 

How often have the words abattoir and butcher's hook occurred in a corpus of books? (source: Google Ngram Viewer )