abattoir vs slaughtering

abattoir

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

  • A public slaughterhouse for cattle, sheep, etc. 

slaughtering

noun
  • An act of slaughter; a killing. 

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