quilt vs duvet

quilt and duvet both are nouns.

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

As nouns, duvet is a hyponym of quilt; that is, duvet is a word with a more specific, narrower meaning than quilt:

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

Other hyponyms of quilt include continental quilt, eiderdown, patchwork, patchwork quilt.

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

quilt (verb)	duvet (verb)
create by stitching together
stitch or sew together