armoury vs arsenal

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. 

arsenal

noun
  • A stock of weapons, especially all the weapons that a nation possesses. 

  • A military establishment for the storing, development, manufacturing, testing, or repairing of arms, ammunition, and other war materiel; an armoury. 

  • A store or supply of anything. 

  • Any supply of aid collected to prepare a person or army for hardship 

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