Whenever I go to America I feel like I’m rich with all the money in my wallet. Though, they are all one dollar bills.
Paper cash is paper money.
This word uses the on'yomi reading for 紙 even though you went through all that trouble to learn the kun'yomi reading. Did you know paper money is made of sheep (し)? Well, part sheep, but there's sheep in there for sure. That's why you can wash your paper money with your t-shirts in the washing machine.