Fetching details from the dictionary...
presenter; speaker
performer; actor; participant (in a TV show or TV panel)
演者がステージでスピーチを始めました。
The presenter began their speech on stage.
演者は講義で新しい理論を説明した。
The speaker explained a new theory during the lecture.
演者の話を聞いて感動を受けました。
I was moved by the presenter's speech.