flashlight vs headlamp

flashlight

noun
  • A battery-powered hand-held light source. 

  • A flashgun (device used to create flashes of light for photography). 

verb
  • To illuminate with a flashlight. 

headlamp

noun
  • An individual headlight, particularly of a motor vehicle. 

  • A flashlight worn on the head. 

How often have the words flashlight and headlamp occurred in a corpus of books? (source: Google Ngram Viewer )