noun / proper noun
protector
pruh-TEK-ter/prəˈtektər/
Someone or something that guards against harm.
The man is her protector, shielding her from hail with an umbrella.

Etymology
A protector is literally one that covers in front: the same shielding image behind protection. The agent ending names whoever or whatever performs that guarding role.
In context
I have zero scratches on my screen because like they're the only ones to ever see the screen without a screen protector on
More examples
- A screen protector helps prevent scratches on my phone.
- Surge protectors shield electronics from sudden increases in voltage.
- Oliver Cromwell governed England as Lord Protector.
Forms
protector · protectors
protect verb — To keep someone or something safe.
protection noun — The act of guarding against harm.