assassin vs iceman

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. 

iceman

noun
  • An assassin. 

  • One who is cool under pressure. 

  • A human figure carved out of ice. 

  • A man who is skilled in travelling upon ice, as among glaciers. 

  • A person who trades in ice; a person employed to deliver block ice. 

  • An ancient human male mummified in ice. 

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