assigner vs distributor

assigner

noun
  • One who, or that which, assigns. 

distributor

noun
  • One who or that which distributes. 

  • A device that distributes electric current, especially to the spark plugs in an internal combustion engine. 

  • A machine for distributing type. 

  • An appliance, such as a roller, in a printing press, for distributing ink. 

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