small change vs spending money

small change

noun
  • Coins of little value kept in one's pocket or bag. 

  • A minor or insignificant amount of money. 

  • A person or thing of little importance or value. 

spending money

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

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