cacolet vs midden

cacolet

noun
  • A single litter mounted on a pack animal. 

  • One of a pair of chairs or litters mounted on a pack animal (horse, mule, camel) 

midden

noun
  • 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. 

  • A dungheap. 

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