leaf litter vs remains

leaf litter

noun
  • Dead plant material, such as fallen leaves, bark, and twigs, that has fallen to the ground and may be used by animals as habitat or for nest-building, eventually decomposing and releasing nutrients into the soil. 

remains

noun
  • What is left after a person (or any organism) dies; a corpse. 

  • All that is left of the stock of some things; remnants. 

  • Historical or archaeological relics. 

  • The extant writings of a deceased person. 

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