troublemaker

/ˈtrʌbəlˌmeɪkər/
noun
  1. A person who causes problems, arguments, or disruptions, often on purpose.
    • The new student was labeled a troublemaker after starting several fights.
    • The manager warned the employee that if he kept being a troublemaker, he would be fired.
    • In every group project, there is always one troublemaker who doesn't do their share.
Antonyms