Prime rate and Prime interest rate

Prime interest rate and prime rate are semantically related in interest rate topic. In some cases you can use "Prime interest rate" instead a noun phrase "Prime rate".

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

Prime rate and prime interest rate are semantically related in sum charged for use of money topic. You can use "Prime rate" instead a noun phrase "Prime interest rate".