Hydrocarbon fuels are a type of fuel composed of hydrogen and carbon atoms. Common examples of hydrocarbon fuels include GAS (3 letters), COAL (4 letters), ethane (6 letters), and GASOLINE (8 letters). GAS is a colorless, odorless, flammable GAS that is used in many applications such as heating and cooking. COAL is a combustible black or brownish-black sedimentary rock that is used to generate electricity and heat. Ethane is a colorless, odorless, flammable GAS that is used as a feedstock for the production of other chemicals. GASOLINE is a petroleum-derived liquid that is used as fuel in internal combustion engines.