Discipline: The practice of training people to obey rules or a code of behavior, using punishment to correct disobedience.
Punishment: The infliction or imposition of a penalty as retribution for an offense
You broke the rules there for I have to discipline you, and I have decided that your punishment shall be to do 100 push-ups
Drill: Instruction or training in military exercises.
Order: An authoritative command, direction, or instruction.
Order! Order, stay in your lines, don’t panic, there is a fire, this is not a drill.