Mouthpiece (woodwind)
The mouthpiece of a woodwind instrument is that part of the instrument which is placed partly in the player's mouth. Single-reed instruments, capped double-reed instruments, and fipple flutes have mouthpieces while exposed double-reed instruments and open flutes do not.
Read more about Mouthpiece (woodwind): Single-reed Instruments, Capped Double Reed Instruments, Fipple Flutes