instructor [instructors](one who instructs; a teacher) noun [UK: ɪn.ˈstrʌk.tə(r)] [US: ˌɪn.ˈstrək.tər]
supervisor [supervisors](a person with the official task of overseeing the work of a person or group etc.) noun [UK: ˈsuː.pə.vaɪ.zə(r)] [US: ˈsuː.pər.ˌvaɪ.zər]