knacker's yard vs welter

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. 

welter

noun
  • A general confusion or muddle, especially of a large number of items. 

  • A tossing or rolling about. 

verb
  • To roll around; to wallow. 

  • To wither; to wilt. 

  • To rise and fall, to tumble over, to roll. 

  • To revel, luxuriate. 

adj
  • Heavyweight. 

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