nonentity vs unbeing

nonentity

noun
  • the state of not existing; nonexistence 

  • an unimportant or insignificant person 

unbeing

noun
  • Nonexistence. 

  • A nonbeing; an entity of no existence or significance. 

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