comforter vs sympathiser

comforter and sympathiser both are nouns.

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

As nouns, comforter and sympathiser are synonyms defined as:

comforter and sympathiser: a person who commiserates with someone who has had misfortune

Other synonyms of comforter include sympathizer.

comforter (noun)	sympathiser (noun)
bedding made of two layers of cloth filled with stuffing and stitched together	someone who shares your feelings or opinions and hopes that you will be successful
device used for an infant to suck or bite on	a person who commiserates with someone who has had misfortune
a person who commiserates with someone who has had misfortune
a person who reduces the intensity (e.g., of fears) and calms and pacifies