| bulwark(noun, support, cover, position, block) |
| barrier(noun, support, block, bar, protection) |
| wall(noun, cover, position, block, bar) |
| fortification(noun, support, cover, position, block) |
| barricade(noun, cover, position, block, bar) |
| bastion(noun, support, cover, position, guard) |
| defense(noun, support, cover, block, bar) |
| embankment(noun, support, cover, position, block) |
| fence(noun, cover, position, block, bar) |
| breastwork(noun, fortification, stronghold, wall, embankment) |
| dike(noun, cover, position, block, bar) |
| guard(noun, support, cover, position, bar) |
| parapet(noun, support, cover, position, block) |
| battlement(noun, defense, fortification, wall, embankment) |
| earthwork(noun, fortification, stronghold, wall, embankment) |
| protection(noun, support, cover, position, guard) |
| security(noun, support, cover, position, guard) |
| bunker(defense, bulwark) |
| defence |
| mole(noun, defense) |