different between underworld vs avernus

English

under- +? world

underworld (plural underworlds)

(mythology) The world of the dead, located underneath the world of the living; the afterlife.
That part of society that is engaged in crime or vice.
(video games) The portion of a game that is set below ground.
Antonym: overworld
- 2016, Alyse Knorr, Super Mario Bros. 3: Boss Fight Books #13
  In the underworld theme, low notes create a darker feeling that matches the cave setting. This song also creates a sense of continuity across early Mario games, since it's a remix of SMB1's original underworld theme.

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