assassin vs slaughterman

assassin

noun
  • Any ruthless killer. 

  • A member of the Nizari Ismaili Muslim community of the Alamut Period. 

  • Someone who intentionally kills a person, especially a professional who kills a public or political figure. 

verb
  • To assassinate. 

slaughterman

noun
  • A man employed to slaughter animals in a slaughterhouse. 

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