armor vs supply depot

armor

noun
  • A military formation consisting primarily of tanks or other armoured fighting vehicles, collectively. 

  • A protective layer over a body, vehicle, or other object intended to deflect or diffuse damaging forces. 

  • Metal plate, protecting a ship, military vehicle, or aircraft. 

  • A tank, or other heavy mobile assault vehicle. 

  • A natural form of this kind of protection on an animal's body. 

  • The naturally occurring surface of pebbles, rocks or boulders that line the bed of a waterway or beach and provide protection against erosion. 

verb
  • To equip something with armor or a protective coating or hardening. 

  • To provide something with an analogous form of protection. 

supply depot

noun
  • A facility utilized by armies to store battlefield supplies temporarily on or near the front lines until they can be distributed to army units. 

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