bell -- (a hollow device made of metal that makes a ringing sound when struck)
doorbell, bell, buzzer -- (a push button at an outer door that gives a ringing or buzzing signal when pushed)
bell, toll -- (the sound of a bell being struck; "saved by the bell"; "she heard the distant toll of church bells")
bell, ship's bell -- ((nautical) each of the eight half-hour units of nautical time signaled by strokes of a ship's bell; eight bells signals 4:00, 8:00, or 12:00 o'clock, either a.m. or p.m.)