conflagration

A conflagration isn't just a few flames; it's an especially large and destructive fire that causes devastation.

That tiny campfire that somehow turned into a raging forest inferno? You could call that intense, uncontrolled blaze a conflagration. Mrs. O'Leary's cow knew a thing or two about conflagrations: It was that unknowing animal that kicked over a kerosene lamp in the night, setting the O'Leary's barn on fire and sending four square miles of the Windy City into that blistering conflagration known as the Great Chicago Fire of 1871.