Stopwatch [ˈstɒpwɒʧ] - секундомер
Timer [ˈtaɪmə] - таймер
A stopwatch - a watch used for measuring the exact time it takes to do something, especially to finish a race.
A timer - an instrument that you use to measure time, when you are doing something such as cooking.
As I clicked my
stopwatch at the start line it began to rain.
Как только я запустил секундомер на старте, начался дождь.
Set the
timer on the cooker for three minutes.
Установите таймер на плите на 3 минуты.