energizer vs device

energizer and device both are nouns.

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

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

energizer (noun)	device (noun)
a device that supplies electrical energy	any clever maneuver
someone who imparts energy and vitality and spirit to other people	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