cacolet vs detritus

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) 

detritus

noun
  • Organic waste material from decomposing dead plants or animals. 

  • Any debris or fragments of disintegrated material. 

  • Pieces of rock broken off by ice, glacier, or erosion. 

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