calefactor vs freezer

calefactor

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

freezer

noun
  • A Parkinson's disease patient that experiences freezing of gait (FOG) episodes. 

  • The section of a refrigerator used to store food or other perishable items at a temperature below 0° Celsius (32° Fahrenheit). 

  • An appliance or room used to store food or other perishable items at temperatures below 0° Celsius (32° Fahrenheit). 

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