The real interest rate is the rate of interest adjusted for inflation, and it is a crucial metric for assessing the return on investments. There are several synonyms for the real interest rate that can be used interchangeably. These include the inflation-adjusted rate, the net or effective real rate, the after-inflation rate, and the inflation-indexed rate. These terms highlight the fact that the real interest rate reflects the true return on investment, as it takes into account the impact of inflation on the value of money. A high real interest rate implies a high return on investment, while a low real interest rate may suggest that investments are not yielding significant inflation-adjusted returns.