-able: This suffix indicates the ability to be something.
* Safe + able = "Safeable" (though this word isn't commonly used).
-ly: This suffix indicates a manner or way.
* Safe + ly = "Safely" (meaning in a safe manner).
-ness: This suffix indicates a state or quality.
* Safe + ness = "Safeness" (meaning the state of being safe).
-guard: This suffix indicates something that protects or defends.
* Safe + guard = "Safeguard" (meaning something that protects against danger).
-ty: This suffix is often used to create words related to safety, but it doesn't always directly translate to "safe."
* Safe + ty = "Safety" (meaning the state of being safe).
The best suffix to use will depend on the context and the specific meaning you want to convey.