henge vs reliquary

henge

noun
  • A prehistoric enclosure in the form of a circle or circular arc defined by a raised circular bank and a circular ditch usually running inside the bank, with one or more entrances leading into the enclosed open space. 

reliquary

noun
  • A container to hold or display religious relics. 

  • A person who owes a balance. 

  • An object that sustains the memory of past people or events. 

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