watcher

nouns

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

"the spectators applauded the performance"; "television viewers"; "sky watchers discovered a new star"

looker, spectator, viewer, watcher, witness

is derived from

is derived from

a guard who keeps watch

security guard, watcher, watchman

is derived from

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

watcher

is a type of (narrower)

a human being

"there was too much for one person to do"