This is because "mount" can be both a noun and a verb:
* Noun: A mountain, a hill, or an elevated piece of land.
* Verb: To climb or ascend, to fix something firmly in place, or to put something on a mount.
For example:
* Noun: The hikers reached the top of the mount.
* Verb: They mounted their horses and rode off.
Let me know if you'd like more examples!