assignee vs delegacy

assignee

noun
  • one who is appointed to act or speak in place of another; an agent 

  • one to whom rights or property is being transferred 

  • one to whom a thing is assigned 

delegacy

noun
  • The position or state of being a delegate. 

  • A collection of delegates. 

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