forge vs steam generator

forge

noun
  • A furnace or hearth where metals are heated prior to hammering them into shape. 

  • A Web-based collaborative platform for developing and sharing software. 

  • A workshop in which metals are shaped by heating and hammering them. 

  • The act of beating or working iron or steel. 

verb
  • To make falsely; to produce, as that which is untrue or not genuine; to fabricate. 

  • To move forward heavily and slowly (originally as a ship); to advance gradually but steadily; to proceed towards a goal in the face of resistance or difficulty. 

  • To create a forgery of; to make a counterfeit item of; to copy or imitate unlawfully. 

  • To advance, move or act with an abrupt increase in speed or energy. 

  • To form or create with concerted effort. 

  • To shape a metal by heating and hammering. 

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 forge and steam generator occurred in a corpus of books? (source: Google Ngram Viewer )