1. One who sits up or continues awake; one who attends upon the sick during the night.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• watchd,
• vaucher,
• waether,
• watchen,
• watche,
• teatcher,
• natcher,
• waher,
• waither,
• warches,
• hacher,
• futcher,
• watcha,
• otcher,
• watchee,
• watchin,
• waches,
• ritcher,
• wother,
• wattched

• watchword,
• witcher,
• witchery.

The adjective form of the word "watcher" is "watchful".

The plural of the "watcher" can be the "watchers".

The singular of the "watcher" can be the "watcher".