IPA: /ˌkæmpəˈnɒlədʒɪst/
KK: /kæmpəˈnɑlədʒɪst/
A person who studies or is skilled in the art of ringing bells.
The campanologist explained the history of bell ringing to the visitors.
Campanologist → It is formed from "campana" (from Latin, meaning bell) and "-logist" (from Greek "logistēs", meaning one who studies or specializes in). A campanologist is someone who studies or specializes in bells.
Think of someone who studies 'bells' ('campana') — that's what a campanologist does.