attorn vs convey

attorn

verb
  • To transfer one's obligations from a person to another person. 

  • To consent to the transfer of one's obligations as tenant under a lease to a new landlord. 

  • To acknowledge the jurisdiction of (a particular court) over one's dispute. 

convey

verb
  • To transfer legal rights (to). 

  • To move (something) from one place to another. 

  • To communicate; to make known; to portray. 

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