calumet vs churchwarden

calumet

noun
  • A clay tobacco-pipe used by American Indians, especially as a symbol of truce or peace. 

churchwarden

noun
  • A churchwarden pipe. 

  • A lay officer of the Church of England who handles the secular affairs of the parish. 

  • A similar functionary of the Episcopal church. 

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