reliever

noun

1. 1

   a pitcher who does not start the game

2. 2

   a person who reduces the intensity (e.g., of fears) and calms and pacifies

   a reliever of anxiety

   an allayer of fears

3. 3

   someone who takes the place of another (as when things get dangerous or difficult)

   the star had a stand-in for dangerous scenes

   we need extra employees for summer fill-ins