What is an exact noun for wind?

There isn't really an exact noun for "wind" in the same way that there is for, say, "water" (H2O). Wind is a phenomenon, a movement of air, and not a specific thing.

However, depending on the context, you could use these more specific nouns:

* Breeze: A gentle wind.

* Gale: A strong wind.

* Hurricane: A powerful and destructive windstorm.

* Tornado: A violently rotating column of air.

* Draft: A current of air, often in a room.

* Gust: A sudden increase in wind speed.

* Zephyr: A soft, gentle breeze.

You could also describe the wind based on its direction:

* East wind

* West wind

* Nor'easter

Ultimately, the best word depends on the specific situation you're describing.