foothill vs versant

foothill

noun

  • A hill at the base of a mountain or mountain range. 

versant

noun

  • a slope of a mountain or mountain ridge 

  • the overall slope of a region 

adj

  • conversant 

  • With the wings erect and open. 

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