mouthpiece

(n) a part that goes over or into the mouth of a person
- the mouthpiece of a respirator
(n) an acoustic device; the part of a telephone into which a person speaks
(n) a spokesperson (as a lawyer) mouth,
(n) (especially boxing) equipment that protects an athlete's mouth gumshield,
(n) the tube of a pipe or cigarette holder that a smoker holds in the mouth
(n) the aperture of a wind instrument into which the player blows directly embouchure,

mouth gumshield embouchure