The term 'doorbell' refers to a device used to alert someone inside a building that someone is at the door. It typically consists of two parts: a CHIME (5 letters) and a BUZZER (6 letters). The CHIME is a device that produces a ringing sound when the doorbell is pressed, while the BUZZER is an electronic device that produces a buzzing sound. Both devices are connected to a button outside the building, which when pressed activates the CHIME or BUZZER.