molester(one who molests) noun [UK: mə.ˈle.stə(r)] [US: mə.ˈle.stər]Nobody knew that John was a dangerous child molester. = Nessuno sapeva che John era un pericoloso molestatore di bambini.
stalker [stalkers](person who secretly follows someone, sometimes with unlawful intentions) noun [UK: ˈstɔːk.ə(r)] [US: ˈstɔːk.ər]