The term 'Voice Box' is a reference to the larynx, which is a 6-letter word. The larynx is an organ in the throat that produces sound and is responsible for speech. It is also known as the 'voice box' because it is the source of the voice. The larynx is composed of cartilage and muscles and is located between the pharynx and the trachea. It is responsible for controlling the pitch and volume of the voice.