rampart, paries, bulwark, palisade, fence, fence in, surround, ceiling, backwall, hallway, more...

door, opening, gateway, entrance, exit

brick, concrete, drywall, stone, wood, plaster, glass, metal, more...

abdominal, posterior, anterior, outer, high, back, lateral, south, north, inner, low

hadrian's heart,   huge barrier,   stone barrier,   great barrier,   edge of a room,   imagined barrier,   steny in the house,   a barrier,   vertical barrier,   layer of bricks