Noun underworld has 2 senses
  1. underworld - the criminal class
    --1 is a kind of
    class, social class, socio-economic class
    --1 has members: organized crime, gangland, gangdom; racketeer
  2. Hel, Hell, Hades, infernal region, netherworld, Scheol, underworld - (religion) the world of the dead; "he didn't want to go to hell when he died"
    --2 is a kind of imaginary place, mythical place
    --2 has parts:
     Acheron, River Acheron; Cocytus, River Cocytus; Lethe, River Lethe; Styx, River Styx
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