noun (n)

• a small natural hill(noun.object)

  Synonym:
  hillock, hummock, knoll, mound
  

  source: wordnet30
• a hanging bed of canvas or rope netting (usually suspended between two trees); swings easily(noun.artifact)

  Synonym:
  sack
  

  source: wordnet30
• A swinging couch or bed, usually made of netting or canvas about six feet long and three feet wide, suspended by clews or cords at the ends.(noun)

  source: webster1913