hammock vs underbrush

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. 

underbrush

noun
  • The small trees and other plants that clutter the floor of a forest. 

verb
  • To clear (an area) of underbrush. 

  • To work among the underbrush. 

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