millionaire vs nabob

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. 

nabob

noun
  • Someone of great wealth or importance. 

  • A person with a grandiose style or manner. 

  • An Indian ruler within the Mogul empire. 

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