nozzle

noun

1. A short tube, usually tapering, forming the vent of a hose or pipe.
2. A short outlet or inlet pipe projecting from the end or side of a hollow vessel, as a steam-engine cylinder or a steam boiler.
3. The nose of an animal; muzzle.

   “At length the acme of a typical Mexican scene was reached when the burros unceremoniously raised their nozzles and brayed loud and long.”

4. The part of an earbud that accommodates eartips.

   “The shape of the nozzle prevents the use of aftermarket eartips.”