ransom vs unbinding

ransom

noun
  • The release of a captive, or of captured property, by payment of a consideration. 

  • A sum paid for the pardon of some great offence and the discharge of the offender; also, a fine paid in lieu of corporal punishment. 

  • Money paid for the freeing of a hostage. 

verb
  • To exact a ransom (payment) in exchange for the freedom of. 

  • To pay a price to set someone free from captivity or punishment. 

unbinding

noun
  • The release or freeing of something that was bound. 

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