Synonyms:
- Klaxon,
- Mayday,
- SOS,
- Texas tower,
- air-raid alarm,
- alarm,
- alarm bell,
- alarm clock,
- alarm signal,
- alarum,
- alert,
- all clear,
- antenna tower,
- barbican,
- beacon,
- belfry,
- bell tower,
- belvedere,
- bench mark,
- bleachers,
- blinking light,
- bookmark,
- bridge,
- burglar alarm,
- buzzer,
- cairn,
- campanile,
- catstone,
- colossus,
- column,
- conning tower,
- crostarie,
- cupola,
- derrick,
- direction,
- dome,
- fiery cross,
- fire alarm,
- fire bell,
- fire flag,
- fire tower,
- five-minute gun,
- flashing light,
- fog bell,
- fog signal,
- foghorn,
- gale warning,
- gallery,
- gazebo,
- grandstand,
- guidance,
- hooter,
- horn,
- hue and cry,
- hurricane warning,
- landmark,
- lantern,
- lightship,
- lookout,
- loophole,
- mark,
- marker,
- martello,
- martello tower,
- mast,
- menhir,
- milepost,
- milestone,
- minaret,
- monument,
- note of alarm,
- obelisk,
- observation post,
- observation tower,
- observatory,
- occulting light,
- outlook,
- overlook,
- pagoda,
- peanut gallery,
- peephole,
- pharos,
- pilaster,
- pillar,
- pinnacle,
- platform,
- pole,
- police whistle,
- pylon,
- pyramid,
- ringside,
- ringside seat,
- seamark,
- shaft,
- sighthole,
- signal of distress,
- siren,
- skyscraper,
- small-craft warning,
- spire,
- standpipe,
- steeple,
- still alarm,
- storm cone,
- storm flag,
- storm warning,
- stupa,
- television mast,
- tocsin,
- top gallery,
- tope,
- tour,
- tower,
- turret,
- two-minute gun,
- upside-down flag,
- watchtower,
- water tower,
- whistle,
- windmill tower