Scheol vs underworld

Scheol and underworld both are nouns.

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

As nouns, Scheol and underworld are synonyms defined as:

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

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