dynamo vs power plant

dynamo

noun
  • An electricity generator; a dynamo-electric machine. 

  • The mechanism by which a celestial body, such as the Earth or a star, generates a magnetic field. 

  • An energetic person. 

power plant

noun
  • A station built for the production of electric power; a power station. 

  • The portion of a vehicle devoted to providing energy for motion; the engine or motor. 

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