vociferator
/voʊˈsɪfəˌreɪtər/
noun
- A person who shouts or cries out loudly and insistently.
- The vociferator at the protest could be heard from three blocks away.
- In the debate, he was known as a vociferator who drowned out quieter voices.
- The coach was a vociferator, always yelling instructions from the sidelines.