仕組
しくみ · shikumi · JLPT N1 · noun
mechanism
⚙️ 仕 (make) + 組 (assemble) = how parts are made and fitted together
仕 means to make or serve; 組 means to assemble or group. Together they name how a thing's parts fit, meaning its structure or mechanism. Shikumi is the everyday word for both.