flasher

nouns

someone with a compulsive desire to expose the genitals
exhibitionist, flasher
is derived from
flash
an electrical device that automatically turns a lamp on and off (as for an advertising display)
flasher
is derived from
flash
is a type of (narrower)
a device that produces or is powered by electricity
electrical device
a light that flashes on and off; used as a signal or to send messages
blinker, flasher
is derived from
flash
is derived from
flash