extinct vs nonextant

extinct

adj
  • No longer in existence; having died out. 

  • No longer active. 

  • No longer used; obsolete, discontinued. 

verb
  • To make extinct; to extinguish or annihilate. 

nonextant

adj
  • Not extant. 

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