informer
🇺🇸
/ɪnˈfɔːrmər/
🇬🇧
/ɪnˈfɔːmə(r)/
A person who provides information, especially about illegal activities.
The police arrested the criminals with the help of an informer.
경찰은 정보제공자의 도움으로 범죄자를 체포했다.