escarpment vs puy

escarpment

noun
  • A steep descent or declivity; steep face or edge of a ridge; ground about a fortified place, cut away nearly vertically to prevent hostile approach. 

puy

noun
  • Any of several cone-shaped hills in the Auvergne, France that are the remains of extinct volcanos 

  • Any similar conical structure of volcanic material 

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