centurion vs chief executive

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. 

chief executive

noun
  • Chief executive officer. 

  • The president of the United States. 

  • The head of government of Hong Kong 

  • The head of government of Macau 

  • The governor of a U.S. state. 

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