a person who carries out a trick or plan to deceive people, such as telling the police there is a bomb somewhere when there is not

If a hoaxer sends a pizza to the wrong address, little damage is done.

A bomb hoaxer brought chaos to the city with a false threat. 一个炸弹恶作剧者用这个虚假的威胁让这座城市陷入了混乱。