ark vs opening ceremony

ark

noun
  • A decorated cabinet at the front of a synagogue, in which Torah scrolls are kept. 

  • Something affording protection; safety, shelter, refuge 

  • The Ark of the Covenant. 

  • A spacious type of boat with a flat bottom. 

  • A large box with a flat lid. 

  • Noah's Ark: the ship built by Noah to save his family and a collection of animals from the deluge. 

opening ceremony

noun
  • A ceremony to mark the official opening of a building or event. 

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