"Prevailing wind" is already a specific term, so there isn't a single, universally accepted synonym. However, here are some terms that convey similar ideas:

* Dominant wind: This emphasizes the wind's importance and its influence on the area.

* Trade wind: This refers specifically to the steady, eastward winds found in the tropics.

* Westerlies: This refers to the prevailing winds blowing from west to east in the middle latitudes.

* Constant wind: This highlights the consistent direction and strength of the wind.

* Regular wind: Similar to "constant wind", this emphasizes the predictable pattern of the wind.

The best alternative will depend on the specific context and the particular aspect of the wind you want to emphasize.