A Dictatorship is where one person utterly has all power and threatens almost anyone who gets in there way, creating an unlimited government. There people almost and practically feel imprisoned forced to live under there "leaders" way and rules fearing for there lives if they disobey.
Let's start off with a comparison. An Anarchy and Dictatorship both give all power to a small group or person as example Kim Jong Un and the Congo. A contrast is that an Anarchy is limited as a Dictatorship is not, A limited government gives some or all control to the citizens as an unlimited government means citizens have no say so having no power or control at all over anything even their lives.
Anarchy. Anarchy is when the government has no power and it all goes to the citizens creating a limited government for there is none at all. The people are free to do what they please believing they should have a lot more as in for example rights! This usually leads to riots and small wars.