massif vs puy

massif

noun
  • A principal mountain mass. 

  • A block of the earth's crust bounded by faults or flexures and displaced as a unit without internal change; normally consists of gneisses and schists 

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