General:
* Wild horse: This emphasizes the horse's untamed nature.
* Mustang: A specific type of wild horse, often associated with the American West.
* Free-ranging horse: This emphasizes the horse's ability to roam freely.
* Pasture horse: This refers to a horse that grazes in an open area, although it may not be wild.
Working horse:
* Cow horse: This is a horse trained to work with cattle.
* Ranch horse: This is a more general term for a horse used on a ranch.
* Buckaroo horse: This is a horse trained to work with cattle in the American West.
Other options:
* Outlaw horse: This refers to a wild horse that is not owned or managed.
* Feral horse: This is another term for a wild horse, but it can also refer to other domesticated animals that have gone wild.
The best synonym for "range horse" will depend on the context and the specific aspect of the horse you want to highlight.