用いる

N1 兼用 kenyou multi-use, combined use N1 公用 kouyou government business, public use, public expense N1 採用 saiyou use, adopt N1 作用 sayou operation, effect, function N1 運用 unyou making use of, application, practical use N1 使用人 shiyounin employee, servant N1 専用 senyou exclusive use, personal use N1 代用 daiyou substitution N1 無用 muyou useless, needlessness, unnecessariness

N4 用 you / mochi.iru utilize, business, service