reflector vs spotting scope

reflector

noun
  • A reflecting telescope. 

  • One who reflects on something; one who thinks or considers at length. 

  • Something which reflects heat, light or sound, especially something having a reflecting surface. 

  • A small, often red, reflecting disk on the rear of a vehicle or bicycle that reflects the headlights of other vehicles. 

  • A safety reflector. 

spotting scope

noun
  • A compact high-power monocular telescope optimized for detailed observation of distant objects such as wildlife or the strike of a bullet on a target. 

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