noun
Refers to a person who presents or announces something publicly, such as at a conference, meeting, or event. Can also refer to the publisher of a work.
学会で発表者が研究結果を説明した。
The presenter explained the research results at the academic conference.
次の発表者は山田さんです。
The next speaker is Mr. Yamada.
講演者 is specifically a lecturer or speaker at a formal lecture, while 発表者 is broader and includes any presenter or announcer.
Compound of 発表 (announcement, presentation) + 者 (person).