covered walk vs peristyle

covered walk

peristyle

noun
  • A sacred roofed courtyard with a central pillar (the potomitan), used as a space for voodoo ceremonies, either alone or as an adjunct to an enclosed temple or altar-room. 

  • A colonnade surrounding a courtyard, temple, etc., or the yard enclosed by such columns. 

  • A porch surrounded by columns. 

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