Both "wind" and "windy" are correct, but they have different meanings and are used in different contexts.
Wind: This refers to the natural movement of air in the atmosphere. It is the general flow of air caused by the Earth's rotation and atmospheric pressure differences. For example, you might say, "The wind is blowing strongly today."
Windy: This is an adjective used to describe weather conditions when there is a lot of wind. It indicates that the air is moving briskly or there is a significant amount of breeze. For example, you might say, "It's a windy day, so hold onto your hat!"
In summary, "wind" refers to the movement of air, while "windy" describes a weather condition with a substantial amount of air movement.
Also, post #42 is a verbatim repeat of post #39, by the same user. @jhonne - don't post the same thing twice, especially after you've been told the information in your post is incorrect.