chief vs millionaire

chief

noun
  • A leader or head of a group of people, organisation, etc. 

  • An informal term of address. 

  • The principal part or top of anything. 

  • An informal term of address for a Native American or First Nations man. 

  • The top part of a shield or escutcheon; more specifically, an ordinary consisting of the upper part of the field cut off by a horizontal line, generally occupying the top third. 

verb
  • To smoke cannabis. 

adj
  • Primary; principal. 

  • Intimate, friendly. 

millionaire

noun
  • A person whose net worth is at or greater than one million units of the local currency; a multimillionaire. 

  • A person whose net worth is at or greater than one million units of the local currency, but less than two million. 

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