Fascism is something you believe. Dictatorship is something you do. Fascism is something you believe because it is first and foremost a type of political ideology. So basically it's a set of principles and beliefs you hold in your head and want to see in the world. Dictatorship in the modern sense is something you do because it is just a type of mangement. A small group gives the orders, the others follow them and nobody from outside the small group can change the small group.(I said modern sense because in ancient times it was a temporary period of rule by the few in a time of crisis to safeguard a less dictatorial way of running things when no crises were around). Hope this helped!