Movement in the air is called a current.
Wind is when the current is noticeable, and coming from a particular direction.
Winds (particularly at sea) are classified by their speed, according to the Beaufort Scale
Scale .... mph ..... Description
0 ............ <1 ..... Calm
1 ........... 1-3 ...... Light air
2 ........... 3-7 ...... Light breeze
3 .......... 8-12 ..... Gentle breeze
4 ........ 13-17 ..... Moderate breeze
5 ........ 18-24 ..... Fresh breeze
6 ........ 25-30 ..... Strong breeze
7 ........ 31-38 ..... High wind, Moderate Gale, Near Gale
8 ........ 39-46 ..... Fresh Gale
9 ........ 47-54 ..... Strong Gale
10 ...... 55-63 ..... Whole Gale/Storm
11 ...... 64-72 ..... Violent storm
12 ......... ≥73 .... Hurricane-force