Synonyms of the word

netherworld

• n. The place to which one's spirit descends upon death, conceived as below the surface of the earth.
• n. The locale of the spirit world or afterlife, whether deemed to be situated below the world of the living…
• n. Specifically, a location of punishment in the afterlife; a hell.
• n. (by extension) A hidden, shadowy, or sinister subculture, such as that of organized crime.

underworld

• n. That part of society that is engaged in crime or vice.
• n. (mythology) The world of the dead, located underneath the world of the living; the afterlife.