I like very specific words and this would help me with a poem I'm writing. Also, if you have any references for very specific words/know any yourself (English or otherwise), they would be appreciated. (:
I think conflagration would work for this.
con·fla·gra·tion noun \ˌkän-flə-ˈgrā-shən\ : a large destructive fire
You could call your fire a three-alarmer:-
One-alarm, two-alarm, three-alarm fires, or higher, are categories of fires indicating the level of response by local authorities, with an elevated number of alarms indicating increased commitment of resources.
This would have the advantage that it has already appeared (or not) in poetry:-
The one L lama, he's a priest
The two L llama, he's a beast
And I will bet my silk pyjama
There isn't any three L lllama.
(Ogden Nash) Some publications have his footnote:-
*The author's attention has been called to a type of conflagration known as a three-alarmer. Pooh.