Synonyms for Munition (same or very similar meaning)
WordNet sense 1 (weapons considered collectively):
arms, weaponry, implements of war, weapons systemWordNet sense 2 (military supplies):
ordnance, ordnance storeWordNet sense 3 (defensive structure consisting of walls or mounds built around a stronghold to strengthen it):
fortificationFrom the ODE community, based on WordNetadd/edit