noun (n)

• someone with a compulsive desire to expose the genitals(noun.person)

  Synonym:
  exhibitionist
  

  source: wordnet30
• an electrical device that automatically turns a lamp on and off (as for an advertising display)(noun.artifact)

  source: wordnet30
• a light that flashes on and off; used as a signal or to send messages(noun.artifact)

  Synonym:
  blinker
  

  source: wordnet30
• One who, or that which, flashes.(noun)

  source: webster1913