WordNet (r) 3.0 (2006):

blowtorch
    n 1: a burner that mixes air and gas to produce a very hot flame
         [syn: blowtorch, torch, blowlamp]

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "blowtorch":
   Jet Liner, acetylene welder, blast lamp, blowpipe, burner,
   business jet, jet, jet plane, multi-jet, pulse-jet, ramjet,
   single-jet, tailless jet, torch, turbojet, twin-jet, welder,
   welding blowpipe