I don't think there is another name other than blade.
A windmill is a building with "sails."
windmill
A Dutch building with sails is commonly called a windmill.
Another name for a windmill is the wind turbine
They were referred to as "four-cornered" sails.
They are referred to as four-cornered sails.
becuse of the force
A windmill does not blow.A windmill is blown by the wind.The windmills sails turn the wind into power to operate machines, pumps or electrical generators.
Windmill vanes are called blades or sails. These are attached to the rotor of the windmill and capture the wind's energy to generate power or perform mechanical work.
The sails on windmills turn when they are hit by the wind. The force of the wind causes the sails to rotate, which in turn drives the machinery inside the windmill to generate power or perform mechanical work. The design of the sails is crucial for capturing the wind efficiently and converting it into rotational motion.
"Four-cornered".
Windmill sails Vane - Any of several usually relatively thin, rigid, flat, or sometimes curved surfaces radially mounted along an axis, as a blade in a turbine or a sail on a windmill, that is turned by or used to turn a fluid.