prefigure vs signify

prefigure

verb
  • To show or suggest ahead of time; to represent beforehand (often used in a Biblical context). 

  • To predict or foresee. 

noun
  • That which prefigures or appears to predict; a harbinger. 

signify

verb
  • To show one’s intentions with a sign etc.; to indicate, announce. 

  • To mean; to betoken. 

  • To make a difference; to matter (in negative or interrogative expressions). 

  • To create a sign out of something. 

  • To give (something) a meaning or an importance. 

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