The best replacement for real money is nominal money.

The best alternatives to real money are rated as following:
★★★★★  nominal money
★★★★  fake money
★★★  play money
★★★  monopoly money
★★★  fiat money
★★  play money poker
★★  fast money
★★  action alerts plus
★★  counterfeit

Your alternative for real money is not listed? Suggest!
Speaking about real money, one probably shouldn't forget about depositing poker.

Other search terms related to real money and their ratings are:
★★★★★ depositing poker
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Google Trends

Scale is based on the average worldwide traffic of real money in all years. Click on graph for more.
real money
nominal money
fake money