golfer vs driver

golfer and driver both are nouns.

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

As nouns, driver is a hyponym of golfer; that is, driver is a word with a more specific, narrower meaning than golfer:

golfer (noun)	driver (noun)
someone who plays the game of golf	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