immortalise vs persist

immortalise

verb
  • To give unending life to, to make immortal. 

  • To make eternally famous. 

persist

verb
  • To cause to persist; make permanent. 

  • To go on stubbornly or resolutely. 

  • To repeat an utterance. 

  • To continue to exist. 

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