regen vs renew

regen

verb
  • To regenerate. 

noun
  • A regenerative radio receiver. 

  • Regeneration. 

renew

verb
  • To make new spiritually; to regenerate. 

  • To replace (something which has broken etc.); to replenish (something which has been exhausted), to keep up a required supply of. 

  • To repeat. 

  • To begin again; to recommence. 

  • To make (something) new again; to restore to freshness or original condition. 

  • To extend a period of loan, especially a library book that is due to be returned. 

noun
  • Synonym of renewal 

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