Synonyms for Comforter (same or very similar meaning)
WordNet sense 1 (commiserates with someone who has had misfortune):
sympathizer, sympathiser
WordNet sense 2 (a person who reduces the intensity (e.g., of fears) and calms and pacifies):
reliever, allayer
WordNet sense 3 (bedding made of two layers of cloth filled with stuffing and stitched together):
puff, quilt
WordNet sense 4 (device used for an infant to suck or bite on):
pacifier, baby's dummy, teething ring
From the ODE community, based on WordNet
add/edit