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Viewer vs Observer - What's the difference?

viewer | observer |

As nouns the difference between viewer and observer

is that viewer is someone that views some spectacle; an onlooker or spectator while observer is one who makes observations, monitors or takes notice.

viewer

English

Noun

(en noun)
  • Someone that views some spectacle; an onlooker or spectator
  • Someone who watches television
  • Any optical device used to view photographic slides
  • (computing) A program that displays the contents of a file of digital images; an image viewer or file viewer
  • observer

    Noun

    (en noun)
  • One who makes observations, monitors or takes notice
  • Most impartial observers agreed that Sampras had not served well.
  • One who adheres or follows laws, guidelines, etc.
  • I shall be an observer of the local customs.
  • A person sent as a representative, to a meeting or other function to monitor but not to participate
  • The UN sent many observers to the country's first elections.
  • (military) A crew member on an aircraft who makes observations of enemy positions or aircraft
  • The only crew-member to survive the crash was the Canadian observer .
  • (military) A sentry etc. manning an observation post
  • We waited till dusk when the observers' vision was poorest.