agora vs shopping center

agora

noun
  • A marketplace, especially in Classical Greece. 

  • Since 1960, a monetary unit and coin of Israel, the 100th part of a shekel / sheqel. 

  • A place for gathering. 

shopping center

noun
  • An area, either enclosed or unenclosed, hosting multiple retail establishments; a shopping mall. 

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