Windfall :: Windfall (n.) Anything blown down or off by the wind, as fruit from a tree, or the tree itself, or a portion of a forest prostrated by a violent wind, etc..
Windfall :: Windfall (n.) An unexpected legacy, or other gain..
Windgall :: Windgall (n.) A soft tumor or synovial swelling on the fetlock joint of a horse; -- so called from having formerly been supposed to contain air.