noun. One that watches or observes.

noun. One who keeps vigil, as at a sick person's bedside.

noun. One who or that which watches.

noun. One who keeps awake for the purpose of guarding or attending upon something or some one; a nurse, watch man, sentry, or the like.

noun. One who observes: as, a watcher of the time.

noun. A spy; one sent to watch an enemy.

noun. One who watches; one who sits up or continues; a diligent observer; specifically, one who attends upon the sick during the night.

noun. someone who watches or observes

noun. someone who keeps vigil

noun. a guard

noun. a close observer; someone who looks at something (such as an exhibition of some kind)

noun. a guard who keeps watch

noun. a person who keeps a devotional vigil by a sick bed or by a dead body