forecast vs prediction

forecast

noun
  • An estimation of a future condition. 

  • exacta 

  • A prediction of the weather. 

verb
  • To estimate how something will be in the future. 

  • To foreshadow; to suggest something in advance. 

prediction

noun
  • A statement of what will happen in the future. 

  • A probability estimation based on statistical methods. 

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