"Ambulation" itself means the act of walking, so there's no single word that acts as a direct synonym for the prefix. However, "walking" is the most common and straightforward way to describe the action of ambulation.
Here are some other words that could be used depending on the context:
* Locomotion: This is a more general term for movement, including walking, running, crawling, etc.
* Striding: This implies a long, purposeful walk.
* Promenade: This refers to a leisurely walk, often for pleasure.
* Traversing: This implies moving across or through a particular area.
The best word to use will depend on the specific meaning you want to convey.