oner vs rarity

oner

noun
  • An extraordinary individual. 

  • A small marble of little worth in children's games. 

  • A long one-take shot, or equivalent animated segment simulating a one-take shot 

  • A conker that has won one match. 

rarity

noun
  • A rare object. 

  • A measure of the scarcity of an object. 

  • Thinness; the property of having low density 

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