8 letters · 11 points in Scrabble
noun someone who takes the place of another (as when things get dangerous or difficult)
noun a person who reduces the intensity (e.g., of fears) and calms and pacifies
noun a pitcher who does not start the game
originEtymology tree English relieve English -er English reliever From relieve + -er.
Etymology from Wiktionary, CC BY-SA 3.0