plectrum vs device

plectrum and device both are nouns.

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

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

plectrum: a small thin device (of metal or plastic or ivory) used to pluck a stringed instrument
device: an instrumentality invented for a particular purpose

plectrum (noun)	device (noun)
a small thin device (of metal or plastic or ivory) used to pluck a stringed instrument	any clever maneuver
	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