reflector vs device

reflector and device both are nouns.

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

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

reflector (noun)	device (noun)
device that reflects radiation	any clever maneuver
optical telescope consisting of a large concave mirror that produces an image that is magnified by the eyepiece	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