The word "placater" refers to a person who attempts to calm someone down or ease their anger or frustration. However, there are many antonyms for this word, which describe a person who does not seek to soothe or pacify others. Some of these antonyms include agitator, instigator, provocateur, troublemaker, nuisance, and irritant. These words suggest a person who intentionally causes unrest or conflict, rather than resolving it. It is important to be aware of these antonyms, as they describe behavior that can cause disruptions and harm to relationships and communities. Instead, we should strive to be peacemakers and problem solvers.