plaza vs shopping mall

plaza

noun
  • A shopping mall. 

  • A town's public square. 

  • A strip mall. 

  • An open area used for gathering in a city, often having small trees and sitting benches. 

shopping mall

noun
  • A shopping center that is usually anchored by department stores. 

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