Synonyms and related words :
alleviative, alleviator, anodyne, assuager, balm, calmative, cushion, dolorifuge, lenitive, moderator, modulator, mollifier, pacificator, pacifier, palliative, peacemaker, restraining hand, salve, sedative, shock absorber, soother, soothing syrup, stabilizer, temperer, tranquilizer, wiser head