gasoline vs natural gas

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. 

natural gas

noun
  • A mixture of gaseous hydrocarbons associated with petroleum deposits; mostly methane with smaller amounts of ethane, propane and butane; principally used as a fuel. 

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