red region vs Inferno

red region and Inferno both are nouns.

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

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

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

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

red region (noun)	Inferno (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