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

ご苦労様[gokurousama] thank you very much for your ...
御苦労さん[gokurousan] I appreciate your efforts
苦力[kuurii] coolie
悪戦苦闘[akusenkutou] hard fighting
気苦労[kigurou] worry

夜露死苦[yoroshiku] well
狭苦しい[semakurushii] cramped
勤苦[kinku] toil and hardship
苦い[nigai] bitter
苦しい[kurushii] painful