buckler

noun buckler

• armor — covering worn to protect the body against weapons
• buffer — A buffer is something that prevents something else from being harmed or that prevents two things from harming each other.
• safeguard — something that serves as a protection or defense or that ensures safety.
• shelter — something beneath, behind, or within which a person, animal, or thing is protected from storms, missiles, adverse conditions, etc.; refuge.
• bulwark — A bulwark against something protects you against it. A bulwark of something protects it.