An air regulator is a device that helps control the pressure of compressed air in various industrial applications. There are several synonyms for the word "air regulator" that are commonly used in different situations. One such synonym is a pressure regulator, which is typically used to adjust and stabilize the pressure of gas or liquid. Another synonym is a pneumatic regulator, which is specifically designed to regulate the pressure of air in pneumatic systems. A third synonym is a pressure control valve, which works by controlling and adjusting the pressure of gas or liquid flowing through pipes or valves. In essence, all these synonyms refer to a device that regulates the pressure of compressed air for various industrial applications.