A stopwatch is a device used to measure time with precision. However, there are a variety of other terms that can be used to describe this important tool. For example, you might refer to a stopwatch as a timer, chronometer, or timepiece. Other common synonyms include a wristwatch, chronograph, or clock. Each of these terms has a slightly different nuance, but they all refer to devices that help users keep time accurately. Whether you are timing a race, measuring the time spent on a task, or simply keeping track of the hours in your day, a good stopwatch is an essential tool to have on hand.