churchwarden vs fistula

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. 

fistula

noun
  • A tube, a pipe, or a hole. 

  • An abnormal connection or passageway between organs or vessels that normally do not connect. 

  • The tube through which the wine of the Eucharist was once sucked from the chalice in certain ceremonies (such as papal Masses). 

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