fossil fuel vs paraffin

fossil fuel

noun
  • Any fuel derived from hydrocarbon deposits such as coal, petroleum, natural gas and, to some extent, peat; these fuels are non-renewable, and their burning moves carbon from underground into the atmosphere via the greenhouse gas carbon dioxide. 

paraffin

noun
  • Any member of the alkane hydrocarbons. 

  • A petroleum-based thin and colourless fuel oil. 

  • paraffin wax. 

verb
  • To impregnate or treat with paraffin. 

  • To embed in paraffin wax. 

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