landfill vs midden

landfill

noun
  • A site at which refuse is buried under layers of earth. 

  • The material so disposed of. 

verb
  • To dispose of (garbage) by burying it at a landfill site. 

midden

noun
  • A refuse heap usually near a dwelling. 

  • A shelter made of vegetation and other materials by packrats. 

  • An accumulation of dried urine and fecal deposits made by hyraxes. 

  • A prehistoric pile of bones and shells. 

  • A dungheap. 

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