duvet vs comforter

duvet and comforter both are nouns.

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

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

duvet: a soft quilt usually filled with the down of the eider
comforter: bedding made of two layers of cloth filled with stuffing and stitched together

Other hypernyms of duvet include comfort, puff, quilt.

duvet (noun)	comforter (noun)
a soft quilt usually filled with the down of the eider	bedding made of two layers of cloth filled with stuffing and stitched together
	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