A pendulum clock is a classic time-keeping device, widely recognized by its swinging pendulum that powers its mechanism. However, there are a variety of synonyms that can be used to describe this beloved clock. For instance, one synonym is "grandfather clock," which is a tall, free-standing version of the pendulum clock. Another popular synonym is "regulator clock," which is a more precise version of the pendulum clock that often features a weight-driven mechanism. Lastly, "anniversary clock" is another common synonym for the pendulum clock due to its ability to keep time for an entire year with a single winding. Regardless of which synonym is used, the pendulum clock remains an iconic piece of technology loved by many.