chauffeur vs driver

chauffeur and driver both are nouns.

Word	Noun	Adjective	Verb	Adverb
chauffeur	Yes	No	Yes	No
driver	Yes	No	No	No

As nouns, driver is a hypernym of chauffeur; that is, driver is a word with a broader meaning than chauffeur:

chauffeur (noun)	driver (noun)
a person paid to drive a privately owned car	a golf club (a wood) with a near vertical face that is used for hitting long shots from the tee
	(computer science) a program that determines how a computer will communicate with a peripheral device
	the operator of a motor vehicle
	a golfer who hits the golf ball with a driver
	someone who drives animals that pull a vehicle

chauffeur (verb)	driver (verb)
drive someone in a vehicle