park vs car park

park and car park both are nouns.

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

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

Other synonyms of park include parking area, parking lot.

park (noun)	car park (noun)
a facility in which ball games are played (especially baseball games)	a lot where cars are parked
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

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