caravanserai vs sarai

caravanserai

noun
  • A home or shelter for caravans. 

  • A roadside inn having a central courtyard where caravans can rest. 

  • An upscale hotel. 

sarai

noun
  • A caravanserai. 

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