The term "keynoter" refers to a speaker who delivers the keynote address at a conference or event. Some synonyms for this word include keynote speaker, main speaker, featured speaker, headliner, plenary speaker, and opening speaker. These individuals are often chosen for their expertise in a particular field or their ability to captivate an audience and set the tone for the rest of the event. Keynoters are essential in helping to generate interest and excitement for the conference or meeting, and their role is vital in ensuring that attendees have a positive experience and receive valuable information that they can use in their personal or professional life.