charnel vs swamp water

charnel

noun
  • A repository for dead bodies. 

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

  • A chapel attached to a mortuary. 

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

swamp water

noun
  • Synonym of suicide (“beverage combining all available flavors at a soda fountain”) 

  • Used other than figuratively or idiomatically: see swamp, water. 

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