cess vs persist

cess

verb
  • To levy a cess. 

noun
  • Usually preceded by good or (more commonly) bad: luck or success. 

  • An assessed tax, duty, or levy. 

  • The area along either side of a railroad track which is kept at a lower level than the sleeper bottom, in order to provide drainage. 

persist

verb
  • To go on stubbornly or resolutely. 

  • To repeat an utterance. 

  • To cause to persist; make permanent. 

  • To continue to exist. 

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