jailer       
noun [ C ] (also UK old-fashioned gaoler) uk/ˈdʒeɪ.lər/ us/ˈdʒeɪ.lɚ/
 监狱看守
a prison guard
  Jailers make hourly safety checks of cells.
 She wasn't assertive enough to yell at inmates when she began to work as a jailer.
 The gaoler returned with a bowl of stew.
 - More examples
 - Jailers realized he was missing at morning roll call.
 - They fear a cell regime would make them vulnerable to abuse by jailers.
 - Jailers estimate that more than half of their inmates got into trouble because of alcoholism or drug addiction.
 - He sometimes seemed more like her gaoler than her husband.