fodder vs fuel

fodder

noun
  • Stuff; material; something that serves as inspiration or encouragement, especially for satire or humour. 

  • People considered to have negligible value and easily available or expendable. 

  • Food for animals; that which is fed to cattle, horses, and sheep, such as hay, cornstalks, vegetables, etc. 

  • A load: various English units of weight or volume based upon standardized cartloads of certain commodities, generally around 1000 kg. 

  • The text to be operated on (anagrammed, etc.) within a clue. 

  • Tracing paper. 

verb
  • To feed animals (with fodder). 

fuel

noun
  • Something that stimulates, encourages or maintains an action. 

  • Substance that provides nourishment for a living organism; food. 

  • Substance consumed to provide energy through combustion, or through chemical or nuclear reaction. 

verb
  • To exacerbate, to cause to grow or become greater. 

  • To provide with fuel. 

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