vane

Vane has 1 syllable.

noun. Mechanical device attached to an elevated structure; rotates freely to show the direction of the wind.

noun. The flattened weblike part of a feather consisting of a series of barbs on either side of the shaft.

noun. Flat surface that rotates and pushes against air or water.

noun. A fin attached to the tail of an arrow, bomb or missile in order to stabilize or guide it.