I don't think there is another name other than blade.
A synonym is a turbine.
Vanes or sails works!
Windmill blades are called sails
sail
Sails
Sail
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 are referred to as four-cornered sails.
They were 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.
by all the wind that builds up on the windmill
"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.
A windmill, like in the Netherlands.