W4I1N1D2M3I1L1L1S1
15 points
WINDMILLS is validvalid
WINDMILL, to rotate solely under the force of a passing airstream [v]
WINDMILL, to rotate from the force of air [v]
WINDMILL, to rotate solely under the force of a passing airstream [v]
WINDMILL, to rotate from the force of air [v]