Other forms: nozzles
A nozzle is the spout at the end of a hose that water flows through.
Any kind of fluid — oil, gasoline — can move through a tube and squirt out of a nozzle, but we usually think of water in a hose, with the nozzle controlling the spray. The root of nozzle is nose, which — if you use a little imagination — describes the shape of most nozzles.