underworld vs Scheol

underworld and Scheol both are nouns.

Word	Noun	Adjective	Verb	Adverb
underworld	Yes	No	No	No
Scheol	Yes	No	No	No

As nouns, underworld and Scheol are synonyms defined as:

Other synonyms of underworld include Hades, Hell, infernal region, netherworld.

underworld (noun)	Scheol (noun)
(religion) the world of the dead	(religion) the world of the dead
the criminal class