Noun watcher has 3 senses
  1. spectator, witness, viewer, watcher, looker - 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"
    --1 is a kind of perceiver, observer, beholder
    --1 has particulars:
     browser; bystander; cheerer; eyewitness; moviegoer, motion-picture fan; ogler; onlooker, looker-on; playgoer, theatergoer, theatregoer; rubberneck; spy; starer; voyeur, Peeping Tom, peeper
    Derived forms: verb watch4, verb watch1
  2. watchman, watcher, security guard - a guard who keeps watch
    --2 is a kind of guard
    --2 is a member of security force, private security force
    --2 has particulars:
     bank guard; fire watcher; lookout, lookout man, sentinel, sentry, watch, spotter, scout, picket; night watchman; patroller; portwatcher, port watcher
    Derived form: verb watch5
  3. watcher - a person who keeps a devotional vigil by a sick bed or by a dead body
    --3 is a kind of
    person, individual, someone, somebody, mortal, human, soul