indicator vs device

indicator and device both are nouns.

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

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

indicator (noun)	device (noun)
a device for showing the operating condition of some system	any clever maneuver
a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time	an instrumentality invented for a particular purpose
a signal for attracting attention	an emblematic design (especially in heraldry)
(chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction	any ornamental pattern or design (as in embroidery)
	something in an artistic work designed to achieve a particular effect