Monarchism :  (noun)

1: a belief in and advocacy of monarchy as a political system

Bourbonism, Nazism, Toryism, backwardness, centralism, collectivism, communism, conservatism, conservativeness, constitutionalism, democratism, die-hardism, extreme right, extreme right wing, extreme rightism, fascism, federalism, feudalism, feudality, governmentalism, imperialism, know-nothingism, laissez-faireism, national socialism, neofascism, old school tie, parliamentarianism, parliamentarism, pluralism, political principles, radical rightism, reaction, reactionariness, reactionaryism, republicanism, rightism, royalism, social Darwinism, socialism, standpattism, statism, ultraconservatism, unprogressiveness,