An observation tower for a lookout to watch over prisoners or watch for fires or enemies.

Roget 441: vision, sight, optics, eyesight.    view, look, espial^†, glance, ken [Scot.], coup d'oeil [Fr.]; glimpse, glint, peep; gaze, stare, leer; perlustration^†, contemplation; conspection^†, conspectuity^†; regard, survey; introspection; reconnaissance, speculation, watch, espionage, espionnage [Fr.], autopsy; ocular inspection, ocular demonstration; sight-seeing.    point of view; gazebo, loophole, belvedere, watchtower.    field of view; theater, amphitheater, arena, vista, horizon; commanding view, bird's eye view; periscope.    visual organ, organ of vision; eye; naked eye, unassisted eye; retina, pupil, iris, cornea, white; optics, orbs; saucer eyes, goggle eyes, gooseberry eyes.    short sight etc. 443; clear sight, sharp sight, quick sight, eagle sight, piercing sight, penetrating sight, clear glance, sharp glance, quick glance, eagle glance, piercing glance, penetrating glance, clear eye, sharp eye, quick eye, eagle eye, piercing eye, penetrating eye; perspicacity, discernment; catopsis^†.    eagle, hawk; cat, lynx; Argus^†.    evil eye; basilisk, cockatrice [Myth.].    ... show more

Roget 668: warning, early warning, caution, caveat; notice etc. (information) 527; premonition, premonishment^†; prediction etc. 511; contraindication, lesson, dehortation^†; admonition, monition; alarm etc. 669.    handwriting on the wall, mene mene tekel upharsin, red flag, yellow flag; fog-signal, foghorn; siren; monitor, warning voice, Cassandra^†, signs of the times, Mother Cary's chickens^†, stormy petrel, bird of ill omen, gathering clouds, clouds in the horizon, death watch.    watchtower, beacon, signal post; lighthouse etc. (indication of locality) 550.    sentinel, sentry, , watch, watchman; watch and ward; watchdog, bandog^†, housedog^†; patrol, patrolman, vedette^†, picket, bivouac, scout, spy, spial^†; undercover agent, mole, plainclothesman; advanced guard, rear guard; lookout.    cautiousness etc. 864.    monitor, guard camera, radar, AWACS, spy satellite, spy-in-the-sky, U2 plane, spy plane.    ... show more

Dutch: wachttoren, uitkijktoren
Polish: wieża strażnicza