| bastion(noun, support, place, cover, position) |
| bulwark(noun, support, cover, position, block) |
| citadel(noun, keep, stronghold, bulwark, support) |
| rampart(noun, support, cover, position, block) |
| barricade(noun, cover, position, block, bar) |
| castle(noun, keep, top, defense, refuge) |
| stronghold(noun, support, hold, cover, keep) |
| barrier(noun, support, block, bar, guard) |
| fort(noun, support, hold, cover, keep) |
| battlement(noun, defense, wall, embankment, reinforcement) |
| garrison(noun, cover, position, guard, shield) |
| munition(noun, defense) |
| redoubt(noun, support, cover, position, top) |
| trench(noun, cover, position, limit, guard) |
| breastwork(noun, support, rock, defense, cell) |
| fence(noun, cover, position, block, bar) |
| defence |
| dike(noun, cover, position, guard, shield) |
| earthwork(noun, defense, cell, stronghold, presidio) |
| escarp |