A camshaft is a mechanical component that is used to operate the intake and exhaust valves of an engine. It is a crucial component of the engine and ensures the proper timing of the engine cycles. However, there are several synonyms for the word "camshaft." Some of them include "valve lifter," "follower rod," "push rod," "rocker arm," "tappet," and "valve lifter arm." These terms are often used interchangeably, depending on the type of engine and the manufacturer's specifications. Regardless of their names, all of these components work together to ensure that the engine runs smoothly and efficiently. So, no matter what term you use, a functioning camshaft is essential for any engine to work properly.