alarm clock, alarm - a clock that wakes sleeper at preset time

Big Ben - clock in the clock tower of the Houses of Parliament, London

chronometer - an accurate clock (especially used in navigation)

clock dial, clock face - the face of a clock showing hours and minutes of the day

cuckoo clock - clock that announces the hours with a sound like the call of the cuckoo

electric clock - a clock using a small electric motor

fusee, fusee drive - a spirally grooved spindle in a clock that counteracts the diminishing power of the uncoiling mainspring

movement - the driving and regulating parts of a mechanism (as of a watch or clock); "it was an expensive watch with a diamond movement"

pendulum clock - a clock regulated by a pendulum

system clock - a time-of-day clock in a computer system

time clock - clock used to record the hours that people work

timepiece, timekeeper - a measuring instrument or device for keeping time

turret clock - a clock with more than one dial to show the time in all directions from a tower

wall clock - a clock mounted on a wall

clepsydra, water clock, water glass - clock that measures time by the escape of water

measure, quantify - express as a number or measure or quantity; "Can you quantify your results?"

mistime - time incorrectly; "She mistimed the marathon runner"