paper money vs spending money

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. 

spending money

noun
  • A sum of cash kept in one's personal possession, for routine expenses or incidental purchases. 

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