parking vs parking lot

parking

noun
  • Space in which to park a car or other vehicle. 

  • The action of the verb to park. 

parking lot

noun
  • An open area, generally paved, where automobiles may be left when not in use. 

  • A road blocked by stop-start traffic. 

How often have the words parking and parking lot occurred in a corpus of books? (source: Google Ngram Viewer )