機械
きかい · kikai · JLPT N3 · noun
machine
⚙️🔧 機 mechanism + 械 contraption = machine; both have the 木 wood radical
Early machines like looms were built of wood, so both kanji carry 木. 機 alone means loom or mechanism (as in 飛行機, airplane); 械 means a device or contraption. For the sound, kikai is close to key guy, the person who fixes the machine.