comforter vs allayer

comforter and allayer both are nouns.

Word	Noun	Adjective	Verb	Adverb
comforter	Yes	No	No	No
allayer	Yes	No	No	No

As nouns, comforter and allayer are synonyms defined as:

comforter and allayer: a person who reduces the intensity (e.g., of fears) and calms and pacifies

Other synonyms of comforter include reliever.

comforter (noun)	allayer (noun)
bedding made of two layers of cloth filled with stuffing and stitched together	a person who reduces the intensity (e.g., of fears) and calms and pacifies
device used for an infant to suck or bite on
a person who commiserates with someone who has had misfortune
a person who reduces the intensity (e.g., of fears) and calms and pacifies