assignee vs grantee

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 

grantee

noun
  • The person to whom something is granted. 

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