bell tower, game reserve, chatelaine, casbah, canal, captivity, castle, campanile, bailey, fosse, pound, nature reserve, game preserve, reservation, furrow, battlements, castellated, belfry, menagerie, preserve, petting zoo, trench, channel, chateau
defense (part of speech: noun)
cover, armor, aversion, answer, backfire, harbor, counterattack, retort, buffer, countermeasure, response, fortress, reply, protection, return, barricade, support, resistance, stronghold, safeguard, guard, shield, rebuttal, shelter, barrier, security, defense, argument, wall, screen
- Go to the moat. - "The Way of the Gods", John Luther Long.
- Long ago the moat that surrounded the castle had been filled in. - "The Last Shot", Frederick Palmer.
- Presently they passed under a bridge and entered that part of the canal which forms a moat for the fortress. - "The Gadfly", E. L. Voynich.