protector
//prəˈtɛktər//
Noun
protectorSingular
protectorsPlural
1
A person or thing that protects someone or something from harm, danger, or injury.
The dog acted as a protector of the children.
2
A device or covering that shields something from damage or wear.
I always put a screen protector on my phone to prevent scratches.
3
A regent who rules a kingdom during the minority, absence, or incapacity of the monarch.
The duke served as protector of the realm while the young king was still a child.