clock; watch; timepiece

bell (often a large hanging bell); chime

chimes; toll of a bell

to beat fast (of a heart); to hammer

alarm bell; fire bell

warning; wake-up call

to ring an alarm bell

Idiomatic expression

to sound a warning; to blow a whistle; to warn; to raise the alarm; to send a wake-up call

belfry; bell tower

alarm bell

limestone cave; limestone cavern

bells and drums (for music or signals)