assignee vs legatee

assignee

noun
  • one to whom a thing is assigned 

  • one to whom rights or property is being transferred 

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

legatee

noun
  • One who receives a legacy. 

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