lot vs car park

lot and car park both are nouns.

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

As nouns, car park is a hyponym of lot; that is, car park is a word with a more specific, narrower meaning than lot:

Other hyponyms of lot include park, parking area, parking lot, building site, vacant lot.

lot (noun)	car park (noun)
anything (straws or pebbles etc.) taken or chosen at random	a lot where cars are parked
an unofficial association of people or groups
any collection in its entirety
a parcel of land having fixed boundaries
(often followed by `of') a large number or amount or extent
your overall circumstances or condition in life (including everything that happens to you)

lot (verb)	car park (verb)
administer or bestow, as in small portions
divide into lots, as of land, for example