horoscopist vs soothsayer

horoscopist

noun
  • One versed in horoscopy; an astrologer. 

soothsayer

noun
  • One who predicts the future, using magic, intuition or intelligence; a diviner. 

  • A mantis or rearhorse. 

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