caravanserai vs posada

caravanserai

noun
  • An upscale hotel. 

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

  • A home or shelter for caravans. 

posada

noun
  • An inn in Spanish-speaking regions. 

  • A traditional Mexican Christmas procession. 

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