The Collaborative International Dictionary of English v.0.48:

Conflagration \Con`fla*gra"tion\, n. [L. conflagratio: cf. F.
   conflagration.]
   A fire extending to many objects, or over a large space; a
   general burning.
   [1913 Webster]

         Till one wide conflagration swallows all. --Pope.
   [1913 Webster]

WordNet (r) 3.0 (2006):

conflagration
    n 1: a very intense and uncontrolled fire [syn: conflagration,
         inferno]

Moby Thesaurus II by Grady Ward, 1.0:

44 Moby Thesaurus words for "conflagration":
   backfire, balefire, beacon, beacon fire, blaze, bonfire,
   burning ghat, campfire, cheerful fire, combustion, corposant,
   cozy fire, crackling fire, crematory, death fire, fen fire, fire,
   flame, flashing point, flicker, flickering flame, forest fire,
   fox fire, funeral pyre, holocaust, ignis fatuus, ignition, inferno,
   ingle, lambent flame, marshfire, open fire, prairie fire, pyre,
   raging fire, sea of flames, sheet of fire, signal beacon,
   smudge fire, three-alarm fire, two-alarm fire, watch fire,
   wildfire, witch fire