Ukaz (from the Russian YKA3, ukaz, decree): In tsarist Russia, an imperial or religious proclamation that carried the force of law. After the Bolshevik Revolution, such a proclamation was generally called a dekret, decree. Under the current Russian constitution, an ukaz is a presidential decree not necessarily carrying force of law.
Zakaz (from the Russian 3AKA3, zakaz, order): An order at any Russian governmental level that implies direct and instant obedience.
Bikaz (related to the Russian root -KA3, -kaz, to show? to speak?): The way Maia pronounces the word "because," which carries force of law and implies direct and instant obedience.