Military land forces
armed force, standing army, regulars, soldiery, soldiers, troops, men, cavalry, force de frappe (French), infantry, artillery, land forces, reserves, militia, the military; see also air force, artillery 2, infantry.
A unit of an army, sense 1
division, regiment, air mobile division, armored division, airborne division, infantry division, regiment, battalion, company, battery, corps, brigade, flight, wing, amphibious force, task force, detail, detachment, squad, troop, platoon, blocking force, patrol, unit, command, formation, point, squadron, maniple, cohort, decury, column, legion, platoon, outfit.
Any large group
A very large number of things grouped together:cloud, crowd, drove, flock, horde, host, legion, mass, mob, multitude, ruck1, score (used in plural), swarm, throng. See big, group