dead president vs paper money

dead president

noun
  • A piece of US paper currency. 

  • Used other than figuratively or idiomatically: see dead, president. 

paper money

noun
  • Cash in the form of banknotes. 

  • A type of joss paper resembling banknotes burnt to venerate the deceased, ancestor spirits, deities, etc. 

How often have the words dead president and paper money occurred in a corpus of books? (source: Google Ngram Viewer )