mountaintop vs puy

mountaintop

noun
  • The summit of a mountain. 

adj
  • Situated or occurring on the summit of a mountain. 

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 mountaintop and puy occurred in a corpus of books? (source: Google Ngram Viewer )