protector
n. countable B2 Upper Intermediate US //pɹəˈtɛktɝ// UK //pɹətˈɛktɐ// pro·tec·tor
n. someone or something that keeps you safe from harm or damage. You might use this for a person, a piece of equipment, or even a law.
n. a person or thing that guards against injury, damage, or loss. Often used in legal or historical contexts to describe a person appointed to look after the interests of another.
He has always been a loyal protector of his younger sister.
The new law acts as a protector of consumer rights by preventing companies from hiding extra fees.
In many ancient mythologies, the mountain was seen as a divine protector that shielded the valley from the harsh northern winds and invading armies.
Usage
Often followed by the preposition 'of' to indicate what is being guarded.