墙壁
qiángbì · HSK 5
wall
🧱 墙壁 = wall (墙) + wall/partition (壁); both mean wall, doubled for emphasis
墙 and 壁 are near-synonyms meaning wall; pairing them forms a clear two-syllable noun. 壁 also appears in 隔壁 (next door) and 壁画 (mural), always tied to wall surfaces.
墙 — earth radical 土 + 啬 (qiáng/sè) phonetic
墙 is a semantic-phonetic compound. The earth radical 土 signals the meaning, since ancient walls were built from packed earth or mud bricks. The right side 啬 supplies the sound, originally depicting a granary, hinting at enclosing and storing. Together they form 'wall'.