protector

noun
UK /prəˈtektə/
US /prəˈtektər/

A protector is someone or something that keeps you safe from harm.

The brave dog was a good protector for the little children.


OTHER MEANINGS

2. A person who takes care of someone or something.

She became the protector of the old library.

3. A thing you wear to keep a part of your body safe.

He wore a mouth protector while playing hockey.

4. A country or group that defends another weaker one.

The big country acted as a protector of the small island.