tower a structure taller than its diameter; can stand alone or be attached to a larger building
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Wiktionary
Substantiv
lighthouse -
A building, usually a tower, containing a light to warn or guide ships.
Wikipedia
A lighthouse is a tower, building, or other type of structure designed to emit light from a system of lamps and lenses or, in older times, from a fire, and used as an aid to navigation for pilots at sea or on inland waterways. Lighthouses are used to mark dangerous coastlines, hazardous shoals and reefs, and safe entries to harbors, and can also assist in aerial navigation. Once widely used, the number of operational lighthouses has declined due to the expense of maintenance and replacement by modern electronic navigational aids.
OmegaWiki Dictionary
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lighthouse A building designed to emit light as an aid to ship navigation.