noun (n)

• (Greek mythology) the god of the underworld in ancient mythology; brother of Zeus and husband of Persephone(noun.person)

  Synonym:
  aides, aidoneus, pluto
  

  source: wordnet30
• (religion) the world of the dead(noun.cognition)

  Example:
  No one goes to Hades with all his immense wealth.
  

  Synonym:
  hell, infernal region, netherworld, scheol, underworld
  

  source: wordnet30
• The nether world (according to classical mythology, the abode of the shades, ruled over by Hades or Pluto); the invisible world; the grave.(noun)

  source: webster1913