[syn: reliever, relief pitcher, fireman]
The Collaborative International Dictionary of English v.0.48:
Reliever \Re*liev"er\ (-?r), n.
   One who, or that which, relieves.
   [1913 Webster]
WordNet (r) 3.0 (2006):
reliever
    n 1: 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" [syn: stand-in, substitute, relief,
         reliever, backup, backup man, fill-in]
    2: a person who reduces the intensity (e.g., of fears) and calms
       and pacifies; "a reliever of anxiety"; "an allayer of fears"
       [syn: reliever, allayer, comforter]
    3: a pitcher who does not start the game [syn: reliever,
       relief pitcher, fireman]