watchtower

[woch-tou-er]
noun
a tower on which a sentinel keeps watch.

Origin:
1535–45; watch + tower

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World English Dictionary
watchtower (ˈwɒtʃˌtaʊə)
 
n
a tower on which a sentry keeps watch

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Because of the structures' hill-top location, archaeologists surmise that they served as a watchtower and lookout point.
In the center of the ring stood a watchtower occupied by observers who were completely concealed from the prisoners.
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