Open English Wordnet
Nouns
(n)stand-in, substitute, relief, reliever, backup, fill-insomeone 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” (n)reliever, allayer, comfortera person who reduces the intensity (e.g., of fears) and calms and pacifies“a reliever of anxiety”,
“an allayer of fears”