troublemaker
n. countable B1 Intermediate US //ˈtɹəbəɫˌmeɪkɝ// UK //tɹˈʌbəlmˌeɪkɐ// trou·ble·mak·er
n. someone who causes problems or makes things difficult for others. You use this to describe a person who likes to start arguments or break rules.
n. a person who causes problems, difficulties, or disruptions. Often carries a negative connotation of intentional mischief or defiance.
The teacher sent the troublemaker to the office.
He was known as a troublemaker in school because he always started fights with the other students.
While some view the new policy as a necessary reform, others see the architect of the change as a troublemaker who deliberately seeks to destabilize the status quo.
From trouble + make + -er.