calefactor vs smithy

calefactor

noun
  • A heater; one who, or that which, makes hot, such as a stove, etc. 

smithy

noun
  • The location where a smith (particularly a blacksmith) works, a forge. 

verb
  • to forge, especially by hand 

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