It is easy to define democracy: it is a system of government by the whole population or all the eligible members of a state, typically through elected representatives. America is a democracy, and Trump was democratically elected.
You seem to have trouble defining Fascism too. “ A fascist is one whose lust for money or power is combined with such an intensity of intolerance toward those of other races, parties, classes, religions, cultures, regions or nations as to make him ruthless in his use of deceit or violence to attain his ends.” By this definition Hillary Clinton and the Democratic Party are fascists, whose intolerance for free market capitalists is so intense that any disagreement with any part of the Democratic dogma will have a dissenter labelled a “basket of deplorables” and subjected to hate-crime levels of vilification.
Hitler’s ally Mussolini was a fascist, but Hitler of course was a Socialist, who called Britain the “Capitalist enemy of the Germany Socialist republic”. Like all Socialists with unlimited power, he quickly established a totalitarian dictatorship, much like Stalin’s and Mao’s Socialist totalitarian dictatorship. It follows that throughout history the worst excesses of inhumanity have been by Socialist Dictatorships: Hitler’s Germany, Pol Pot’s Cambodia, Stalin’s Russia, Mao’s China, Kim Il-sung’s North Korea, the list goes on. Socialism + Power = Totalitarianism. Socialists are worse than Fascists, but some would argue that Socialists are Fascists. Hitler has been called a Fascist so often that the definition of Fascism blurs into Socialism: perhaps there is now no real difference between the two terms?