"mouthpiece" in the noun sense
1. mouthpiece
a part that goes over or into the mouth of a person
"the mouthpiece of a respirator"
2. mouthpiece
an acoustic device the part of a telephone into which a person speaks
3. mouthpiece, mouth
a spokesperson (as a lawyer)
4. mouthpiece, gumshield
especially boxing) equipment that protects an athlete's mouth
5. mouthpiece
the tube of a pipe or cigarette holder that a smoker holds in the mouth
6. mouthpiece, embouchure
the aperture of a wind instrument into which the player blows directly
Source: WordNet® (An amazing lexical database of English)
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