～機
～き · ～ki · JLPT N2 · noun
machine
⚙️ 機 = tree 木 + 幾 tiny parts: a wooden device of many small parts
機 joins 木 (tree, wood) with 幾 (tiny, how many). Early machines such as looms were wooden frames with many small moving parts. As a suffix ～機 marks devices: 飛行機 airplane, 洗濯機 washing machine, 携帯電話機 handset.