attorn vs conveyance

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. 

conveyance

verb
  • To transfer (the title) of an object from one person or group of persons to another. 

noun
  • A means of transporting, especially a vehicle. 

  • An instrument transferring title of an object from one person or group of persons to another. 

  • An act or instance of conveying. 

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