sanctum sanctorum vs synagogue

sanctum sanctorum

noun
  • The Holy of Holies in the Jewish temple. 

  • A person's most private retreat or sanctuary. 

synagogue

noun
  • A place of worship for Jews or Samaritans. 

  • A congregation of Jews or Samaritans for the purpose of worship or religious study. 

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