diverge vs variate

diverge

verb
  • To become different; to run apart; to separate; to tend into different directions. 

  • To separate, to tend into a different direction (from another line or path). 

  • To run apart; to separate; to tend into different directions. 

  • To become different, to separate (from another line or path). 

  • Not to converge: to have no limit, or no finite limit. 

  • Both stories start out the same way, but they diverge halfway through. 

variate

verb
  • To alter; to vary; to make or become different. 

noun
  • The measured magnitude of a variable. 

  • random variable 

  • A variable, often the set of x values plotted on a graph. 

  • A measurable quantity capable of taking on a number of values. 

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