flasher vs electrical device

flasher and electrical device both are nouns.

Word	Noun	Adjective	Verb	Adverb
flasher	Yes	No	No	No
electrical device	Yes	No	No	No

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

flasher: an electrical device that automatically turns a lamp on and off (as for an advertising display)
electrical device: a device that produces or is powered by electricity

flasher (noun)	electrical device (noun)
an electrical device that automatically turns a lamp on and off (as for an advertising display)	a device that produces or is powered by electricity
a light that flashes on and off; used as a signal or to send messages
someone with a compulsive desire to expose the genitals