leaded petrol vs leaded gasoline

leaded petrol and leaded gasoline both are nouns.

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

As nouns, leaded petrol and leaded gasoline are synonyms defined as:

leaded petrol and leaded gasoline: gasoline treated with a lead compound to reduce motor knocks

leaded petrol (noun)	leaded gasoline (noun)
gasoline treated with a lead compound to reduce motor knocks	gasoline treated with a lead compound to reduce motor knocks