comforter vs device

comforter and device both are nouns.

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

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

comforter (noun)	device (noun)
bedding made of two layers of cloth filled with stuffing and stitched together	any clever maneuver
device used for an infant to suck or bite on	an instrumentality invented for a particular purpose
a person who commiserates with someone who has had misfortune	an emblematic design (especially in heraldry)
a person who reduces the intensity (e.g., of fears) and calms and pacifies	any ornamental pattern or design (as in embroidery)
	something in an artistic work designed to achieve a particular effect