Read the dictionary definition of reliever. All definitions for this word.
1. a pitcher who does not start the game
2. a person who reduces the intensity (e.g., of fears) and calms and pacifies
1. a reliever of anxiety
2. an allayer of fears
3. someone who takes the place of another (as when things get dangerous or difficult)
1. the star had a stand-in for dangerous scenes
2. we need extra employees for summer fill-ins