Windsock and Wind vane

Windsock noun - A truncated cloth cone mounted on a mast; used (e.g., at airports) to show the direction of the wind.

Wind vane and windsock are semantically related in device showing wind direction topic. In some cases you can use "Wind vane" instead a noun "Windsock".

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

Windsock and wind vane are semantically related in device showing wind direction topic. You can use "Windsock" instead a noun phrase "Wind vane".