disciplinarian
nounUK /ˌdɪsəplɪˈneəriən/
US /ˌdɪsəplɪˈneriən/
A person who makes people follow rules and punishes them when they don't.
The school principal was a strict disciplinarian who expected everyone to behave.
RELATED WORDS
OTHER MEANINGS
2. A person who believes in strict obedience and control.
As a disciplinarian, she never let her students talk out of turn.
3. Someone who trains others to obey rules through firm methods.
The coach was a tough disciplinarian who made the team practice every day.
4. A person who enforces order in a group or organization.
The new manager acted as a disciplinarian to keep the office running smoothly.