supervisor

noun

1. A person with the official task of overseeing the work of a person or group, or of other operations and activities.

   “Near-synonyms: superintendent, manager, boss, executive, overseer”

   “Thus, today, even if the objective does seem "goalish," the supervisor assumes the problem inherent in trying to "accomplish" that goal will become clear to the librarian as the action plan evolves […]”

   “The 1999 merger between Citibank (banking) and Travelers (insurance) created the model for megafinance and confirmed new challenges for supervisors.”

   “I had learned a lot about supervising by observing other supervisors—the good things and the not-so-good things they did.”

2. A person who monitors someone to make sure they comply with rules or other requirements set for them.

   “Kashruth fraud in Brooklyn. Seems a goon squad of fake mashgichim or kosher supervisors have been making their way around the neighborhoods pulling surprise ‘inspections’ on different shops and restaurants, selling them fancy-looking certificates to put in the window […]”

3. (US)In certain states, an elected member of the governing body for a county which is called the board of supervisors.
4. A process responsible for managing other processes.

   “The clock burst which enables the supervisor to housekeep the console input and output and to change program status is currently set to 200 ms.”