WordNet sense 1 (a public official authorized to decide questions brought before a court of justice):

judge, jurist, magistrate

WordNet sense 2 (the United States federal department responsible for enforcing federal laws (including the enforcement of all civil rights legislation); created in 1870):

DoJ, Department of Justice, Justice Department

WordNet sense 3 (the quality of being just or fair):

justness

WordNet sense 4 (the administration of law; the act of determining rights and assigning rewards or punishments):

judicature