accurate
12-hour, 24-hour
digital, electric
atomic
time
bedside, kitchen
alarm, carriage, cuckoo, grandfather, pendulum, travel (AmE), travelling (BrE), wall
ticking
countdown (AmE)
His countdown clock reads forty seconds.

biological, body, circadian (biology), internal
With jet lag, your biological clock is out of synch with the actual time.

reset, set, wind
I've set my alarm clock for six tomorrow.

move back (AmE), put back (BrE), set back (AmE), turn back (often figurative)
Let's turn back the clock to the last decade.

move ahead (AmE), put forward (BrE), set ahead (AmE), turn forward (often figurative)
calibrate, synchronize
stop (for example in a game)
Pressing the buzzer stops the clock.

check, glance at, look at
watch
employees who are always watching the clock (= wanting their day's work to end)

beat (= do something in less time than is allowed)
The player beat the clock and set a new record.

beep, buzz, chime (sth), ring, strike sth, tick
The clock struck the hour.
I could hear a clock ticking somewhere in the house.

stop
keep time
This clock doesn't keep time.

be fast, be slow
That clock's fast.

gain time, lose time
be right, be wrong
go back, go forward
The clocks go back tonight.

say sth, tell sth
The clock on the wall said twelve o'clock.
Her clock told her it was time to get up.

go off
My alarm clock didn't go off this morning.

face
tower
radio

against the clock
to work against the clock (= to work fast in order to finish before a particular time)

around the clock, round the clock (= all day and all night)
to work around the clock

by the clock
It's ten o'clock by the kitchen clock.

the dial of a clock, the face of a clock, the hands of a clock

Clock is used with these nouns as the object:
mile