comforter vs doer

comforter and doer both are nouns.

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

As nouns, doer is a hypernym of comforter; that is, doer is a word with a broader meaning than comforter:

comforter: a person who reduces the intensity (e.g., of fears) and calms and pacifies
doer: a person who acts and gets things done

Other hypernyms of comforter include actor, worker.

comforter (noun)	doer (noun)
bedding made of two layers of cloth filled with stuffing and stitched together	a person who acts and gets things done
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