fuel vs galvanism

fuel

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

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

  • Something that stimulates, encourages or maintains an action. 

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

  • To provide with fuel. 

galvanism

noun
  • The chemical generation of electricity. 

  • The therapeutic use of electricity directly applied to the body. 

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