red region vs Hell

red region and Hell both are nouns.

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

As nouns, Hell is a hypernym of red region; that is, Hell is a word with a broader meaning than red region:

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

Other hypernyms of red region include infernal region, Inferno, nether region, perdition, pit.

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