centurion vs police officer

centurion

noun
  • An officer of the ancient Roman army, in command of a century of soldiers. 

  • A player who scores a century. 

  • A pilot in the United States Navy who has performed 100 night landings on an aircraft carrier. 

police officer

noun
  • A peace officer who is a member of a police force. 

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