The word "guard" has several synonyms, each with a slightly different meaning or context. Some examples of synonyms for "guard" are "protect," "watch," "defend," "secure," and "shield." While "guard" typically refers to the act of protecting something or someone from harm, "watch" often implies a more observant role, keeping an eye out for any potential danger. "Defend" suggests a more active role in repelling or combating threats, while "secure" implies taking measures to prevent threats from occurring. "Shield" suggests a physical barrier or protection from harm. Depending on the context, one synonym may be more appropriate than another.