charger vs troop horse

charger

noun
  • A large horse trained for battle and used by the cavalry (of a lighter build than a destrier). 

  • A speed loader that holds several cartridges together in a single unit for easier loading of a firearm's magazine. 

  • A rectal concealment container for prohibited material such as money, drugs and tools. 

  • A large platter. 

  • One who charges. 

  • A device that charges or recharges. 

  • A large decorative plate, sometimes used under dinner plates or other savoury-dish vessels in a multi-course meal; also service plate or underplate. 

  • Synonym of hard charger (“person with a good work ethic”) 

troop horse

noun
  • A cavalry horse. 

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