holocaust vs knacker's yard

holocaust

noun
  • A complete or large offering or sacrifice. 

  • Complete destruction by fire; also, the thing so destroyed. 

  • An offering or sacrifice to a deity that is completely burned to ashes. 

  • Extensive destruction of a group of animals or (especially) people; a large-scale massacre or slaughter. 

verb
  • To sacrifice (chiefly an animal) to be completely burned. 

  • To destroy (something) completely, especially by fire. 

  • To subject (a group of people) to a holocaust (mass annihilation); to destroy en masse. 

knacker's yard

noun
  • A (notional) place to send a person or object that is spent beyond all reasonable use. 

  • The area of a slaughterhouse where carcasses unfit for human consumption or other purposes are rendered down to produce useful materials such as glue. 

How often have the words holocaust and knacker's yard occurred in a corpus of books? (source: Google Ngram Viewer )