WordNet (r) 3.0 (2006):

dong
    n 1: the basic unit of money in Vietnam
    v 1: go `ding dong', like a bell [syn: ding, dong,
         dingdong]

Moby Thesaurus II by Grady Ward, 1.0:

24 Moby Thesaurus words for "dong":
   chime, chink, clang, clangor, clank, clink, ding, dingdong, gong,
   jangle, jingle, jinglejangle, knell, peal, ring, ring changes,
   sound, sound a knell, ting, tingle, tink, tinkle, tintinnabulate,
   toll