turn into vs variate

turn into

verb
  • To transform into; cause to become. 

  • To transform into; become. 

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 turn into and variate occurred in a corpus of books? (source: Google Ngram Viewer )