charnel vs urnfield

charnel

noun
  • A chapel attached to a mortuary. 

  • Part of a helm, now usually identified as the hinge (near the neck) by which the helm was secured to the breastplate. 

  • A repository for dead bodies. 

adj
  • Of or relating to a charnel, deathlike, sepulchral. 

urnfield

noun
  • Ground used as a cemetery in Bronze Age Europe, in which the ashs of cremations were buried in cinerary urns. 

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