roaster vs water boiler

roaster

noun
  • A furnace used in making ball soda. 

  • A hot Jupiter. 

  • A kitchen utensil used for roasting. 

  • An objectionable person; somebody making a fool of themselves. 

  • A chicken, pig, etc. suitable for roasting. 

  • One who roasts or banters, especially as a comedy routine. 

  • One who roasts food. 

water boiler

noun
  • An electric device which heats water up to boiling temperature. 

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