chillum vs chimney pot

chillum

noun
  • The part of such a pipe that contains the tobacco and charcoal balls. 

  • A conical pipe used for smoking marijuana, usually made of fired clay, porcelain, soapstone, glass or, more rarely, wood. 

chimney pot

noun
  • A short earthenware pipe, placed on top of a chimney to improve the draft. 

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