camping vs pied-à-terre

camping

noun
  • The recreational activity of temporarily living in a tent or similar accommodation, usually in the wilderness. 

  • The act of setting up a camp. 

pied-à-terre

noun
  • A smaller temporary or secondary lodging; a second home. 

  • A house in the city. 

How often have the words camping and pied-à-terre occurred in a corpus of books? (source: Google Ngram Viewer )