• 壁かべ — wall; partition
• 城壁じょうへき — castle walls; ramparts
• 岩壁がんぺき — rock wall; cliff
• 岸壁がんぺき — quay; wharf face
• 絶壁ぜっぺき — sheer cliff; precipice
• 壁画へきが — mural
• 鉄壁てっぺき — ironclad; impregnable

A phono-semantic build: 土 marks earth or masonry, while the phonetic element 辟 gives the reading ヘキ and the sense of a barrier. From house partitions to towering cliff faces, 壁 names structures that block, protect, or divide.