dynamo vs means

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. 

means

noun
  • An instrument or condition for attaining a purpose. 

  • Resources; riches. 

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