A speaker is someone who speaks publicly, and there are many different words to describe this role. A SPOKESMAN is someone who speaks on behalf of a group or organization, while a voicer is someone who speaks with authority. An utterer is someone who speaks out loud, and a sayer is someone who expresses their opinion. An ORATOR is someone who speaks in a powerful and persuasive way, while a LECTURER is someone who gives a formal talk or presentation. A tris is someone who speaks in a loud and clear voice, and a MADAM is someone who speaks in a polite and respectful manner. Finally, a squawkbox is someone who speaks in an annoying and irritating way.