petrol vs gasoline

petrol and gasoline both are nouns.

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

As nouns, petrol and gasoline are synonyms defined as:

petrol and 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

Other synonyms of petrol include gas, gasolene.

petrol (noun)	gasoline (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