Getaway is a noun. When you escape, you make your getaway. A location can also be a getaway
Get away is a verb and a modifier. To get away from something or someone is to move away or to escape.
Example: If the robbers get away from the police, they will make their getaway.
Example: Get away from the dog! He bites!
Example: We hope to get away to the cabin this summer. It is our summer getaway.