WordNet (r) 3.0 (2006):

shillelagh
    n 1: a cudgel made of hardwood (usually oak or blackthorn) [syn:
         shillelagh, shillalah]

Moby Thesaurus II by Grady Ward, 1.0:

29 Moby Thesaurus words for "shillelagh":
   Malacca cane, alpenstock, bat, baton, billy, billy club, bludgeon,
   cane, club, crook, crosier, cross, cross-staff, crutch,
   crutch-stick, handstaff, knobkerrie, lituus, mace, pastoral staff,
   paterissa, quarterstaff, staff, stave, stick, swagger stick,
   swanking stick, truncheon, walking stick