assignee vs heritor

assignee

noun
  • one to whom rights or property is being transferred 

  • one to whom a thing is assigned 

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

heritor

noun
  • A person who inherits; an heir or heiress. 

  • A proprietor or landholder in a parish. 

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