胃壁[iheki] stomach lining
外壁[gaiheki] outer wall
隔壁[kakuheki] barrier wall
岸壁[ganpeki] wharf
胸壁[kyouheki] chest walls

合壁[gappeki] neighbor with just a wall between
磁壁[jiheki] magnetic domain
障壁[shouheki] enclosing wall
城壁[jouheki] rampart
絶壁[zeppeki] precipice

西貢[saigon] Saigon
瑞西[suisu] Switzerland
西藏[seizou] Tibet
新西蘭[nyuujiirando] New Zealand
伯剌西爾[burajiru] Brazil

墨西哥[mekishiko] Mexico
以西[isei] ... and westward
関西[kansai] Kansai (south-western half of Japan, including Osaka)
関西辯[kansaiben] Kansai dialect
古今東西[kokontouzai] all times and places