big wheel vs millionaire

big wheel

noun
  • A person with a great deal of power or influence, especially a high-ranking person in an organization. 

  • A Ferris wheel. 

  • A low-riding tricycle with a large front wheel. 

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 big wheel and millionaire occurred in a corpus of books? (source: Google Ngram Viewer )