* Disciple: A follower of a teacher, leader, or philosophy.
* Discipline: A branch of knowledge, a system of rules, or the practice of training someone to obey rules.
* Disciplinary: Relating to discipline or punishment.
* Disciplinarian: A person who enforces rules strictly.
* Discipulate: To teach or train as a disciple.
Note: While "discipulus" is the Latin root, many of these words are derived from the Latin verb "discipere," meaning "to learn."