futurity vs probability

futurity

noun

  • A future event. 

  • The state of being in the future. 

  • The future. 

probability

noun

  • An event that is likely to occur. 

  • The state of being probable; likelihood. 

  • A number, between 0 and 1, expressing the precise likelihood of an event happening. 

  • The relative likelihood of an event happening. 

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