A propeller can be seen as a rotating fin in water or a wing in air. The horizontal axis of rotation produces a dynamic force as thrust. The force produced is from the difference in pressure from the forward and rear surfaces of the blades.
F4U Corsair propeller
Soviet 14-ton Voroshilov cruiser proppeller at the Museum on Sapun Mountain, Sevastopol
Schiffsschraubenflügel in Saarlouis
Propellers on the Ticonderoga-class cruiser USS Cowpens