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