hammock vs leaf litter

hammock

noun
  • A piece of land thickly wooded, and usually covered with bushes and vines. 

  • A swinging couch or bed, usually made of netting or canvas about six feet wide, suspended by clews or cords at the ends. 

verb
  • To make something be wrapped tight, like in a hammock. 

  • To lie in a hammock. 

  • To hang in a way that resembles a hammock. 

  • To schedule (a new or unpopular programme) between two popular ones in the hope that viewers will watch it. 

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. 

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