There are a few different synonyms that can be used for the term "gas pump." One of the most common is simply "fuel pump," which accurately describes what the device does. Another term that is sometimes used, especially in more formal contexts, is "petrol pump." This term is more common in countries like the UK and Australia, where "petrol" is more commonly used than "gasoline" or "gas." In some cases, the term "filling station" may be used to refer to the entire facility where gas is sold, but it can also be used to refer specifically to the gas pumps themselves. Finally, some people may simply refer to a gas pump as a "gas dispenser" or "fuel dispenser".