Synonyms for Dictatorship (same or very similar meaning)
WordNet sense 1 (a form of government in which the ruler is an absolute dictator (not restricted by a constitution or laws or opposition etc.)):
absolutism, authoritarianism, despotism, shogunate, totalitarianism, tyranny, monocracy, Caesarism, Stalinism, one-man ruleFrom the ODE community, based on WordNetadd/edit