Price of money and Rate of interest

Rate of interest and price of money are semantically related in interest rate topic. In some cases you can use "Rate of interest" instead a noun phrase "Price of money", when it comes to topics like sum charged for use of money.

Rate of interest noun - The percentage of a sum of money charged for its use.

Price of money and rate of interest are semantically related in interest rate topic. You can use "Price of money" instead a noun phrase "Rate of interest", if it concerns topics such as sum charged for use of money.