magnate vs millionaire

magnate

noun
  • A person of rank, influence or distinction in any sphere. 

  • In medieval and early modern Italy, a member of a legally defined category of especially wealthy patrician families, often deprived of the right to political participation by republican governments. 

  • Powerful industrialist; captain of industry. 

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