dargah vs mausoleum

dargah

noun
  • A shrine associated with the grave of a Muslim saint or similar religious figure. 

mausoleum

noun
  • A large stately tomb or a building housing such a tomb or several tombs. 

  • A gloomy, usually large room or building. 

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