Synonyms for Army (same or very similar meaning)
WordNet sense 1 (the army of the United States of America; the agency that organizes and trains soldiers for land warfare):
USA, United States Army, U. S. Army, US ArmyWordNet sense 2 (a permanent organization of the military land forces of a nation or state):
ground forces, regular armyFrom the ODE community, based on WordNetadd/edit