WordNet (r) 3.0 (2006):

chop down
    v 1: cut down; "George chopped down the cherry tree"

Moby Thesaurus II by Grady Ward, 1.0:

47 Moby Thesaurus words for "chop down":
   beat down, blow down, blow over, bowl down, bowl over, break down,
   bring down, bulldog, bulldoze, burn down, cast down, cut down,
   dash down, deck, down, drop, fell, fetch down, flatten, floor,
   ground, hew down, knock down, knock over, lay level, lay low,
   lay out, level, mow down, precipitate, prostrate, pull down, rase,
   raze, send headlong, smash, spread-eagle, steamroller, supinate,
   take down, tear down, throw, throw down, topple, trip, tumble,
   whack down