carafe vs double boiler

carafe

noun
  • A glass pot with a spout for pouring, used for both serving coffee and as a receptacle during the brewing process. 

  • A bottle, usually glass and with a flared lip, used for serving water, wine, or other beverages. 

double boiler

noun
  • A pair of interlocking pots, the lower one filled with water which when boiling heats the contents of the upper pot. 

  • A large pan containing hot water, into which other smaller pans are set in order to cook food at low heat (below the boiling point) or to keep food warm. 

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