racing car vs car

racing car and car both are nouns.

Word	Noun	Adjective	Verb	Adverb
racing car	Yes	No	No	No
car	Yes	No	No	No

As nouns, car is a hypernym of racing car; that is, car is a word with a broader meaning than racing car:

racing car: a fast car that competes in races
car: a motor vehicle with four wheels; usually propelled by an internal combustion engine

Other hypernyms of racing car include auto, automobile, machine, motorcar.

racing car (noun)	car (noun)
a fast car that competes in races	a motor vehicle with four wheels; usually propelled by an internal combustion engine
	a wheeled vehicle adapted to the rails of railroad
	where passengers ride up and down
	the compartment that is suspended from an airship and that carries personnel and the cargo and the power plant
	a conveyance for passengers or freight on a cable railway