flasher vs light source

flasher and light source both are nouns.

Word	Noun	Adjective	Verb	Adverb
flasher	Yes	No	No	No
light source	Yes	No	No	No

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

flasher: a light that flashes on and off; used as a signal or to send messages
light source: any device serving as a source of illumination

Other hypernyms of flasher include light.

flasher (noun)	light source (noun)
an electrical device that automatically turns a lamp on and off (as for an advertising display)	any device serving as a source of illumination
a light that flashes on and off; used as a signal or to send messages
someone with a compulsive desire to expose the genitals