Weapons and Equipment
- Weapons: Rifles, Machine guns, Artillery, Pistols, Bayonets, Flamethrowers, Gas masks, Aircraft
- Vehicles: Tanks, Armored cars, Trucks, Motorcycles, Bicycles, Airplanes
People and Places
- Wilhelm II (Emperor of Germany), Woodrow Wilson (President of the United States), Winston Churchill (British Prime Minister), Women's suffrage movement, Women in War, Western Front, Eastern Front, Gallipoli, Ypres, Verdun, Somme
Events and Strategies
- War crimes, War propaganda, Trench warfare, World War I Peace Conference, Women's suffrage movement, Withdraw, Wire