gas pump vs island dispenser

gas pump and island dispenser both are nouns.

Word	Noun	Adjective	Verb	Adverb
gas pump	Yes	No	No	No
island dispenser	Yes	No	No	No

As nouns, gas pump and island dispenser are synonyms defined as:

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

Other synonyms of gas pump include gasoline pump, petrol pump.

gas pump (noun)	island dispenser (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