door·bell 
(dôrbĕl′)
(dôrbĕl′)n.
A bell, chime, or buzzer outside a door that is rung to announce the presence of a visitor or caller.
- subclinical
- subclinically
- subcommittee
- subcompact
- subcomponent
- subconference
- subconscious
- subconsciously
- subconsciousness
- subcontinent
- subcontinental
- subcontract
- subcontractor
- subcontrary
- subcortex
- subcortical
- subcortically
- subcritical
- subcultural
- subculture
- subcutaneous
- subcutaneously
- subcutis
- subdeacon
- subdeb