predictor vs prognosticant

predictor

noun

  • Something that anticipates, predicts, or foretells. 

  • A predictor variable. 

prognosticant

noun

  • Synonym of prognosticator. 

adj

  • Synonym of prognosticatory. 

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