The antonyms for the word "more low-ranking" are "higher-ranking," "more senior," or "superior." These words describe individuals who hold a higher position in an organization or hierarchy. They possess more power, responsibility, and influence than those who are lower-ranking. They are vital to the functioning of any organization or system, as they oversee the work of those below them, provide guidance and direction, and make critical decisions. It is important to recognize and respect the importance of these individuals, as their leadership and expertise are essential for the success of any team or project.