Synonyms for Inferno (same or very similar meaning)
WordNet sense 1 (any place of pain and turmoil):
hell, hellhole, hell on earth, the pits, snake pitWordNet sense 2 (a very intense and uncontrolled fire):
conflagrationWordNet sense 3 ((Christianity) the abode of Satan and the forces of evil; where sinners suffer eternal punishment):
perdition, pit, nether region, infernal regionFrom the ODE community, based on WordNetadd/edit