gasoline vs petrol

gasoline and petrol both are nouns.

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

As nouns, gasoline and petrol are synonyms defined as:

gasoline and petrol: a volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines

Other synonyms of gasoline include gas, gasolene.

gasoline (noun)	petrol (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	a volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines