amass vs dispart

amass

verb
  • to gather a great quantity of; to accumulate. 

  • To accumulate; to assemble. 

  • To collect into a mass or heap. 

dispart

verb
  • To make allowance for the dispart in (a gun), when taking aim. 

  • To furnish with a dispart sight. 

noun
  • The difference between the thickness of the metal at the mouth and at the breech of a piece of ordnance. 

  • A piece of metal placed on the muzzle, or near the trunnions, on the top of a piece of ordnance, to make the line of sight parallel to the axis of the bore. 

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