| citadel(noun, support, place, structure, stronghold) |
| stronghold(noun, support, place, cover, position) |
| fortress(noun, support, place, cover, position) |
| bulwark(noun, support, place, cover, position) |
| fortification(noun, support, place, cover, position) |
| rampart(noun, support, cover, position, guard) |
| base complex(significance, facility, army) |
| redoubt(noun, support, cover, position, top) |
| breastwork(noun, support, place, defense, fortification) |
| castle(noun, keep, top, defense, refuge) |
| defense(noun, support, place, cover, guard) |
| fort(noun, support, cover, position, guard) |
| fastness(noun, cover, position, top, guard) |
| defence(noun, armour) |
| resistance(noun, cover, position, guard, shield) |
| parapet(noun, support, place, cover, position) |
| aegis(noun, cover, position, guard, shield) |
| banquette |
| barricade(noun, cover, keep, position, guard) |
| garrison(noun, cover, keep, position, guard) |