gendarme vs sea stack

gendarme

noun
  • A rock pinnacle on a mountain ridge. 

  • A policeman. 

  • A member of the gendarmerie, a military body charged with police duties. 

sea stack

noun
  • A pillar of rock that rises from the ocean, formed by surrounding softer ground eroding away. 

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