eternize vs immortalise

eternize

verb
  • To immortalize; to make eternally famous. 

  • To make or render eternal. 

  • To prolong indefinitely. 

immortalise

verb
  • To make eternally famous. 

  • To give unending life to, to make immortal. 

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