WordNet (r) 3.0 (2006):

aide
    n 1: an officer who acts as military assistant to a more senior
         officer [syn: adjutant, aide, aide-de-camp]
    2: someone who acts as assistant [syn: aide, auxiliary]

Moby Thesaurus II by Grady Ward, 1.0:

85 Moby Thesaurus words for "aide":
   ADC, CO, OD, acolyte, adjutant, agent, aid, aide-de-camp, aider,
   ally, assistant, attendant, auxiliary, best man, brigadier,
   brigadier general, captain, chicken colonel, chief of staff,
   coadjutant, coadjutor, coadjutress, coadjutrix, cohort, colleague,
   colonel, commandant, commander, commander in chief,
   commanding officer, commissioned officer, company officer, comrade,
   deputy, exec, executive officer, field marshal, field officer,
   first lieutenant, five-star general, four-star general, general,
   general officer, generalissimo, girl Friday, help, helper,
   helpmate, helpmeet, jemadar, junior officer, lieutenant,
   lieutenant colonel, lieutenant general, major, major general,
   man Friday, marechal, marshal, officer, one-star general,
   orderly officer, paranymph, paraprofessional, partner, right hand,
   right-hand man, risaldar, second, senior officer, servant,
   shavetail, sideman, sirdar, staff officer, subahdar, subaltern,
   sublieutenant, supporting actor, supporting instrumentalist,
   the Old Man, the brass, three-star general, top brass,
   two-star general