disciplinarian

[ dis-uh-pluh-nair-ee-uh n ]

/ ˌdɪs ə pləˈnɛər i ən /

a person who enforces or advocates discipline: The teacher was a formidable disciplinarian.

disciplinary.

Origin of disciplinarian

First recorded in 1575–85; discipline + -arian

Even the role of disciplinarian often fell to her because, well, he was always traveling.

Gloria Cain: Sex Accusations Make No Sense in 'Old School' Marriage |Michelle Cottle |November 15, 2011 |DAILY BEAST
Owens, the Major, was a very gallant man, and the disciplinarian of the regiment.

History of Morgan's Cavalry |Basil W. Duke
No minister, be he ever so strict a disciplinarian, can find fault with me.

Phemie Frost's Experiences |Ann S. Stephens
Sir Eardley is looking out for some disciplinarian to take the place in hand.

For the Term of His Natural Life |Marcus Clarke

In every capacity of life, he was a disciplinarian who could not brook any breach of rule.

Adventures and Recollections |Bill o'th' Hoylus End
Threats only show weakness on the part of the disciplinarian.

The Mother and Her Child |William S. Sadler

disciplinarian

/ (ˌdɪsɪplɪˈnɛərɪən) /

a person who imposes or advocates discipline

a less common word for disciplinary