car park vs park

car park and park both are nouns.

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

As nouns, car park and park are synonyms defined as:

Other synonyms of car park include parking area, parking lot.

car park (noun)	park (noun)
a lot where cars are parked	a facility in which ball games are played (especially baseball games)
	a gear position that acts as a parking brake
	a large area of land preserved in its natural state as public property
	a piece of open land for recreational use in an urban area
	a lot where cars are parked

car park (verb)	park (verb)
	place temporarily
	maneuver a vehicle into a parking space