armor vs preservation

armor

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

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

  • 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. 

preservation

noun
  • The act of preserving; care to preserve; act of keeping from destruction, decay or any ill. 

  • The state of being preserved, how something has survived. 

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