(shopping) arcade vs agora

(shopping) arcade

agora

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

  • A place for gathering. 

  • A marketplace, especially in Classical Greece. 

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