Hell vs red region

Hell and red region both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hell	Yes	No	No	No
red region	Yes	No	No	No

As nouns, red region is a hyponym of Hell; that is, red region is a word with a more specific, narrower meaning than Hell:

Hell: (Christianity) the abode of Satan and the forces of evil; where sinners suffer eternal punishment
red region: a place of eternal fire envisaged as punishment for the damned

Other hyponyms of Hell include Gehenna, Tartarus, hellfire.

Hell (noun)	red region (noun)
(Christianity) the abode of Satan and the forces of evil; where sinners suffer eternal punishment	a place of eternal fire envisaged as punishment for the damned
(religion) the world of the dead