Stopwatch and Sundial

Stopwatch noun - A timepiece that can be started or stopped for exact timing (as of a race).

Sundial and stopwatch are semantically related in timekeeping device topic. In some cases you can use "Sundial" instead a noun "Stopwatch", when it comes to topics like device that tells time.

Sundial noun - Timepiece that indicates the daylight hours by the shadow that the gnomon casts on a calibrated dial.

Stopwatch and sundial are semantically related in timekeeping device topic. You can use "Stopwatch" instead a noun "Sundial", if it concerns topics such as device that tells time.