The Collaborative International Dictionary of English v.0.48:

Berg \Berg\, n. [[root]95. See Barrow hill, and cf.
   Iceberg.]
   A large mass or hill, as of ice.
   [1913 Webster]

         Glittering bergs of ice.                 --Tennyson.
   [1913 Webster]

WordNet (r) 3.0 (2006):

berg
    n 1: a large mass of ice floating at sea; usually broken off of
         a polar glacier [syn: iceberg, berg]
    2: Austrian composer in Schoenberg's twelve-tone music system
       (1885-1935) [syn: Berg, Alban Berg]

Moby Thesaurus II by Grady Ward, 1.0:

48 Moby Thesaurus words for "berg":
   Dry Ice, calf, cryosphere, firn, floe, frazil, frozen water,
   glaciation, glacier, glacieret, glaze, glazed frost, granular snow,
   ground ice, growler, ice, ice banner, ice barrier, ice belt,
   ice cave, ice cubes, ice dike, ice field, ice floe, ice foot,
   ice front, ice island, ice needle, ice pack, ice pinnacle,
   ice raft, ice sheet, iceberg, icefall, icequake, icicle, jokul,
   lolly, neve, nieve penitente, pack ice, serac, shelf ice, sleet,
   slob, sludge, snow ice, snowberg