arcade vs back alley

arcade

noun
  • A covered passage, usually with shops on both sides. 

  • An establishment that runs coin-operated games. 

  • A row of arches. 

verb
  • To cover (something) as with a series of arches. 

back alley

noun
  • An alleyway that runs behind a row of houses, or between rows of houses 

  • The anus. 

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