IPA: /ˈtʃætərər/
KK: /ˈtʃætərər/
A person who talks a lot, often in a lively or noisy way.
The chatterer at the party kept everyone entertained with stories and jokes.
Chatterer → It is formed from "chatter" (from Middle English *chateren*, meaning to talk rapidly or incessantly) and "-er" (meaning a person who). A chatterer is a person who talks rapidly or incessantly.
Think of someone who talks a lot and is always 'chattering' — that's why a chatterer is a person who chats a lot.