ご苦労様[gokurousama] thank you very much for your ...
御苦労さん[gokurousan] I appreciate your efforts
慰労[irou] recognition of services
過労[karou] overwork
過労死[karoushi] death from overwork and mental stress

気苦労[kigurou] worry
漁労[gyorou] fishing
共労者[kyourousha] coworker
勤労[kinrou] labor
勤労階級[kinroukaikyuu] salaried class

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