martyry vs stupa

martyry

noun
  • A shrine at a site which "bears witness" to a crucial religious event not related to a tomb. 

  • A shrine in honor of a (usually religious, notably Christian) martyr, possibly at his grave. 

stupa

noun
  • A dome-shaped Buddhist monument, used to house relics of the Lord Buddha. 

  • A stupe (medicated cloth or sponge). 

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