WordNet (r) 3.0 (2006):

comptroller
    n 1: someone who maintains and audits business accounts [syn:
         accountant, comptroller, controller]

Moby Thesaurus II by Grady Ward, 1.0:

64 Moby Thesaurus words for "comptroller":
   Big Brother, CA, CPA, accountant, accountant general, actuary,
   auditor, bank accountant, bank examiner, boatswain, bookkeeper,
   boss, bursar, calculator, cashier, cashkeeper,
   certified public accountant, chamberlain, chartered accountant,
   chief, clerk, controller, cost accountant, cost keeper, curator,
   depositary, depository, financial officer, floor manager, floorman,
   floorwalker, foreman, gaffer, ganger, head, headman, inspector,
   journalizer, liquidator, monitor, noncommissioned officer, overman,
   overseer, paymaster, proctor, purse bearer, purser, receiver,
   reckoner, recorder, registrar, sirdar, slave driver, steward,
   straw boss, subforeman, super, superintendent, supervisor,
   surveyor, taskmaster, treasurer, trustee, visitor