MPH is an abbreviation for miles per hour and is commonly used to measure speed in many different fields of transportation and engineering. However, if you want to add some variety to your writing or speech, there are several synonyms for MPH that you can use. These include "knots" which is used to measure the speed of watercraft, "feet per second" which is primarily used in aviation and meteorology, and "meters per second" which is more commonly used in science. Additionally, "kilometers per hour" is a commonly-used metric measurement that is equivalent to MPH and is used in many countries around the world.