“After all, what is a dictator?”
A ruler who uses power to shut down dissent. (For whatever reason, monarchs aren’t included in that.) Yes Trump is heading this way. Putting troops on the streets of D.C. may be a precursor to using a part of the state that is subservient to him (such as ICE) to blockade voting booths.
“What is a fascist?”
One who follows the principles of fascism, which is a movement AGAINST the masses, unlike, say socialism which professes to be FOR the masses. An interesting point about fascism is that it can only get in power when most of its subjects do NOT consider themselves ‘the masses’. Whether Trump represents fascism is merely debateable, which is actually a harsh criticism of him. Only an idiot would consider Biden, Obama, the Bushes, Clinton, Reagan or Carter to represent fascism.
“What is a Nazi?”
One who follows the principles of Nazism. The biological superiority of white people, most notably Nordic types, plus conspiracy theories about Jews. Trump does not represent Nazism, but deserves more harsh criticism for failing to disavow its followers as his supporters.