我利勉[gariben] drudge
俄勉強[niwakabenkyou] cramming
勉める[tsutomeru] to endeavor (endeavour)
勤勉[kinben] diligent
刻苦勉励[kokkubenrei] being arduous

試験勉強[shikenbenkyou] cramming for exams
勉めて[tsutomete] as much as possible
不勉強[fubenkyou] idleness
勉学[bengaku] study
勉強[benkyou] study

奥勤め[okuzutome] working as a lady's maid
過勤[kakin] overwork
皆勤[kaikin] perfect attendance
外勤[gaikin] working away from the office
勤まらない[tsutomaranai] unfit for

勤まる[tsutomaru] to be fit for
勤め[tsutome] service
勤める[tsutomeru] to work (for)
勤め気[tsutomegi] mercenary spirit
勤め口[tsutomeguchi] position