The Collaborative International Dictionary of English v.0.48:

Steeple \Stee"ple\ (st[=e]"p'l), n. [OE. stepel, AS. st[=e]pel,
   st[=y]pel; akin to E. steep, a.] (Arch.)
   A spire; also, the tower and spire taken together; the whole
   of a structure if the roof is of spire form. See Spire. "A
   weathercock on a steeple." --Shak.
   [1913 Webster]

   Rood steeple. See Rood tower, under Rood.

   Steeple bush (Bot.), a low shrub (Spiraea tomentosa)
      having dense panicles of minute rose-colored flowers;
      hardhack.

   Steeple chase, a race across country between a number of
      horsemen, to see which can first reach some distant
      object, as a church steeple; hence, a race over a
      prescribed course obstructed by such obstacles as one
      meets in riding across country, as hedges, walls, etc.

   Steeple chaser, one who rides in a steeple chase; also, a
      horse trained to run in a steeple chase.

   Steeple engine, a vertical back-acting steam engine having
      the cylinder beneath the crosshead.

   Steeple house, a church. [Obs.] --Jer. Taylor.
      [1913 Webster]

WordNet (r) 3.0 (2006):

steeple
    n 1: a tall tower that forms the superstructure of a building
         (usually a church or temple) and that tapers to a point at
         the top [syn: steeple, spire]

Moby Thesaurus II by Grady Ward, 1.0:

56 Moby Thesaurus words for "steeple":
   antenna tower, barbican, belfry, bell tower, campanile, cog,
   colossus, column, comb, crag, cupola, derrick, dome, fang,
   fire tower, harrow, jag, lantern, lighthouse, martello,
   martello tower, mast, minaret, monument, obelisk,
   observation tower, pagoda, peak, pecten, pilaster, pillar,
   pinnacle, pole, projection, pylon, pyramid, rake, ratchet,
   sawtooth, shaft, skyscraper, snag, snaggle, spire, sprocket, spur,
   standpipe, stupa, television mast, tooth, tope, tour, tower,
   turret, water tower, windmill tower