The term "whistle stopper" is often used to describe someone who is charismatic and able to engage a crowd with their speeches. Some synonyms for this term could include "orator," "public speaker," "rhetorician," "motivational speaker," "debater," and "campaigner." These individuals are often skilled in the art of persuasive communication and have a way of connecting with their audience on an emotional level. They may be politicians, activists, or business leaders, but their ability to inspire and influence others is what sets them apart. Whether speaking from a stage, at a rally, or a boardroom, these individuals use their words to make a lasting impact on their listeners.