liquidation vs serial killer

liquidation

noun
  • Murder of dehumanized victims. 

  • The act of exchange of an asset of lesser liquidity with a more liquid one, such as cash. 

  • The selling of the assets of a business as part of the process of dissolving the business. 

serial killer

noun
  • A person who commits multiple (more than two) murders, especially similar ones with no obvious motive over a period of time with a "cooling-off" period between each murder. 

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