What is another word for Bunker in english

The list of words which can be used for Bunker while creating sentence in english language. fortification barricade, reinforcement, fortress, citadel, wall, defense dugout cellar, cave, shelter, excavation, foxhole blockhouse bastion, stronghold, manor, keep, castle, fastness, redoubt trap sand trap sand bunker 
Usage of Bunker in sentences
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