stylus vs device

stylus and device both are nouns.

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

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

stylus (noun)	device (noun)
a pointed tool for writing or drawing or engraving	any clever maneuver
a sharp pointed device attached to the cartridge of a record player	an instrumentality invented for a particular purpose
	an emblematic design (especially in heraldry)
	any ornamental pattern or design (as in embroidery)
	something in an artistic work designed to achieve a particular effect