Comforter
WordNet
noun
(1) Device used for an infant to suck or bite on
(2) Bedding made of two layers of cloth filled with stuffing and stitched together
(3) A person who reduces the intensity (e.g., of fears) and calms and pacifies
"A reliever of anxiety"
"An allayer of fears"
(4) Commiserates with someone who has had misfortune