different between watchtower vs guardtower

English

From watch +? tower.

watchtower (plural watchtowers)

An observation tower in which a lookout keeps watch over prisoners, or looks out for fires, etc.
- 2002: Cecilia Dart-Thornton, The Ill-Made Mute: The Bitterbynde [1]
  Redcap - A malevolent goblin easily distinguishable by their namesake red cap, fiery red eyes, claws and iron boots. They often appear as little old men, but can run very fast despite the boots. They reside in castles and watchtowers along the English-Scottish border, but will move their residence to avoid detection.

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