ashram vs mausoleum

ashram

noun
  • A secluded religious hermitage inhabited by gurus, or the population of such a hermitage. 

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 ashram and mausoleum occurred in a corpus of books? (source: Google Ngram Viewer )