place of worship vs sacellum

place of worship

noun
  • A place, usually a building such as a church, mosque, synagogue or temple where believers can practise their faith. 

sacellum

noun
  • A small chapel, as a monument within a church. 

  • In Ancient Rome, a shrine open to the sky, sometimes used for sacrificial purposes, or in honor of the divine. 

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