kettle vs steam generator

kettle

noun
  • A steam locomotive 

  • An instance of kettling; a group of protesters or rioters confined in a limited area. 

  • A vessel or appliance used to boil water for the preparation of hot beverages and other foodstuffs. 

  • A vessel for boiling a liquid or cooking food, usually metal and equipped with a lid. 

  • A kettle hole, sometimes any pothole. 

  • The quantity held by a kettle. 

  • A group of raptors riding a thermal, especially when migrating. 

  • A kettledrum. 

verb
  • To contain demonstrators in a confined area. 

  • Of a boiler: to make a whistling sound like the boiling of a kettle, indicative of various types of fault. 

steam generator

noun
  • a type of boiler fitted in a diesel locomotive or another rail vehicle, which provided steam heating in steam-heated passenger trains that had previously been hauled by steam locomotives. 

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