shouter
nounUK /ˈʃaʊ.tər/
US /ˈʃaʊ.tɚ/
A shouter is a person who talks very loudly.
The shouter at the back of the crowd made everyone turn around.
OTHER MEANINGS
2. A person who expresses strong opinions loudly and forcefully.
He was a shouter in every debate, never letting anyone else speak.
3. A device or thing that makes a loud sound.
The old alarm was a real shouter, waking the whole street.
4. Someone who calls out to get attention, as in a market.
The market shouter drew customers with his booming voice.