The issue is that there is no more money, only currency. The Constitution mandates that money be backed by gold and silver. What we know of as "money" today AKA Federal Reserve Notes, are just negotiable instruments that show the United States' debt to the Federal Reserve.

That's why I think the Fed can just print "money" whenever they want despite all the inflation that happens. You can infinitely print "money," you can't indefinitely print gold or silver certificates.