infernal region vs Hades

infernal region and Hades both are nouns.

Word	Noun	Adjective	Verb	Adverb
infernal region	Yes	No	No	No
Hades	Yes	No	No	No

As nouns, infernal region and Hades are synonyms defined as:

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

infernal region (noun)	Hades (noun)
(Christianity) the abode of Satan and the forces of evil; where sinners suffer eternal punishment	(religion) the world of the dead
(religion) the world of the dead	(Greek mythology) the god of the underworld in ancient mythology; brother of Zeus and husband of Persephone