abattoir vs slaughterhouse

abattoir

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

  • A public slaughterhouse for cattle, sheep, etc. 

slaughterhouse

noun
  • A place where animals are slaughtered. 

  • The scene of a massacre. 

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