fossil fuel vs gasoline

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. 

gasoline

noun
  • A flammable liquid consisting of a mixture of refined petroleum hydrocarbons, mainly used as a motor fuel; petrol. 

  • Any specific kind of gasoline. 

  • Marijuana, especially very potent or high quality. 

  • An alcoholic beverage made of vodka and energy drink. 

adj
  • Made from or using gasoline. 

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