armoury vs arms

armoury

noun
  • A collection of weapons and materiel. 

  • Heraldry 

  • A place where arms are kept, an arsenal. 

  • A place where arms are made. 

  • The manufacture of armour and arms; arming, armouring. 

arms

noun
  • weaponry, weapons 

  • A visual design composed according to heraldic rules, consisting of a coat of arms normally displayed upon an escutcheon, sometimes accompanied by other elements of an achievement 

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