petrol pump vs gas pump

petrol pump and gas pump both are nouns.

Word	Noun	Adjective	Verb	Adverb
petrol pump	Yes	No	No	No
gas pump	Yes	No	No	No

As nouns, petrol pump and gas pump are synonyms defined as:

petrol pump and gas pump: a pump in a service station that draws gasoline from underground storage tanks

Other synonyms of petrol pump include gasoline pump, island dispenser.

petrol pump (noun)	gas pump (noun)
a pump in a service station that draws gasoline from underground storage tanks	a pump in a service station that draws gasoline from underground storage tanks