dunghill vs midden

dunghill

noun
  • A heap of dung, especially one for agricultural purposes. 

  • Any wretchedly mean, dirty or loathsome place, situation or condition. 

midden

noun
  • A dungheap. 

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

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

  • A refuse heap usually near a dwelling. 

  • A prehistoric pile of bones and shells. 

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