Assuager is a word that refers to a person or thing that soothes or calms someone's fears, pain, or anxiety. There are several other synonyms for this word, such as pacifier, comforter, appeaser, mollifier, and tranquilizer. A pacifier is something that soothes or makes someone feel more comfortable or relaxed, like a baby's pacifier. A comforter is a person or thing that provides comfort, consolation, or solace during times of distress or sadness. An appeaser is someone who tries to satisfy someone's demands or complaints in order to avoid conflict or disagreement. A mollifier is a person or thing that softens or eases someone's anger or frustration. And lastly, a tranquilizer is a medication that sedates or calms someone down.