reliever

definition: a pitcher who does not start the game
example:
speech part: noun
synonyms: fireman
definition: a person who reduces the intensity (e.g., of fears) and calms and pacifies
example: a reliever of anxiety
speech part: noun
synonyms: comforter
definition: someone who takes the place of another (as when things get dangerous or difficult)
example:
speech part: noun
synonyms: stand-in backup man fill-in relief substitute backup

How reliever is being used?