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"lighthouse" is also used as a crossword clue. If that's what you saw, the answer is often pharos (6 letters).
Definitions
a tower with a light that gives warning of shoals to passing ships
Word origin
From light + house.
Used in a sentence
“In the history of lighthouses, English civil engineer John Smeaton made a significant contribution to the design of them.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer14 curated clues
01“Beacon tower”10 letters
02“Beacon by rocky shores”10 letters
03“Beacon for coastal ships”10 letters
04“Beacon tower for boats”10 letters
05“Beacon tower for sailors”10 letters
06“Beacon tower near water”10 letters
07“Coastal beacon building”10 letters
08“Coastal beacon tower”10 letters
09“Coastal tower for ships”10 letters
10“Coastal warning tower”10 letters
11“Seaside signal tower”10 letters
12“Shore beacon for ships”10 letters
13“Tower guiding ships”10 letters
14“Tower that guides ships”10 letters
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