prompter vs device

prompter and device both are nouns.

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

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

prompter (noun)	device (noun)
a device that displays words for people to read	any clever maneuver
someone who assists a performer by providing the next words of a forgotten speech	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