probability vs uncertainty

probability

noun
  • The state of being probable; likelihood. 

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

  • An event that is likely to occur. 

  • The relative likelihood of an event happening. 

uncertainty

noun
  • Doubt; the condition of being uncertain or without conviction. 

  • A parameter that measures the dispersion of a range of measured values. 

  • Something uncertain or ambiguous. 

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