A casemate is a fortified structure or compartment that is designed to protect soldiers or military equipment during a battle. Synonyms for casemate include bunker, shelter, fort, stronghold, redoubt, citadel, barricade, and rampart. A bunker is a protective structure that can survive a direct hit from enemy fire, while a shelter is an enclosed space that provides protection from natural disasters. Fort and stronghold both refer to heavily fortified structures with defensive walls and towers. A redoubt is a small, well-protected fortification. A citadel is a fortress in a city, while a barricade and rampart are both barriers used in fortifications for protection. All of these synonyms for casemate suggest a strong, well-defended structure designed for protection in times of conflict.