WordRel.com

• a pitcher who does not start the game

  synonym	firemanrelief pitcher
  derivation	relieve
  hypernym	hurlerpitchertwirler
  hyponym	closerfinisher

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

  synonym	backupbackup manfill-inreliefstand-insubstitute
  derivation	relieve
  hypernym	compeerequalmatchpeer
  hyponym	alternatedoublelocumlocum tenensreplacementsurrogate

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

  synonym	allayercomforter
  derivation	relieve
  hypernym	actordoerworker