Bank rate and Prime interest rate

Bank rate noun - The discount rate fixed by a central bank.

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

Prime interest rate noun - The interest rate on short-term loans that banks charge their commercial customers with high credit ratings.

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