WordNet (r) 3.0 (2006):

tear down
    v 1: tear down so as to make flat with the ground; "The building
         was levelled" [syn: level, raze, rase, dismantle,
         tear down, take down, pull down] [ant: erect, put
         up, raise, rear, set up]

Moby Thesaurus II by Grady Ward, 1.0:

43 Moby Thesaurus words for "tear down":
   annihilate, asperse, beat down, blow down, break down, bring down,
   bulldoze, burn down, calumniate, cast down, chop down, cut down,
   defame, demolish, denigrate, disassemble, dismantle, dismount,
   fell, flatten, knock down, knock over, level, mow down, prostrate,
   pull down, rase, raze, ruin, scandal, scandalize, shatter, slander,
   slur, smash, smear, steamroller, take apart, take down, throw down,
   unbuild, wrack, wreck