reliquary vs safebox

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. 

safebox

noun
  • A safe-deposit box. 

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