gasoline vs hydrocarbon

gasoline and hydrocarbon both are nouns.

Word	Noun	Adjective	Verb	Adverb
gasoline	Yes	No	No	No
hydrocarbon	Yes	No	No	No

As nouns, hydrocarbon is a hypernym of gasoline; that is, hydrocarbon is a word with a broader meaning than gasoline:

gasoline: a volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines
hydrocarbon: an organic compound containing only carbon and hydrogen

Other hypernyms of gasoline include fuel.

gasoline (noun)	hydrocarbon (noun)
a volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines	an organic compound containing only carbon and hydrogen