cesser vs valediction

cesser

noun
  • termination or cessation. 

  • A neglect of a tenant to perform services, or make payment, for two years. 

valediction

noun
  • The act of parting company. 

  • A word or phrase (such as adieu or farewell) said upon leaving. 

  • A speech made when leaving or parting company. 

  • A word or phrase used to end a letter or message. 

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