A Reactionary is someone who is attempting to use the political process to return society to a perceived Golden Age in which traditional values were properly respected. This can be done through democratic or non-democratic means. A Fascist pursues the Reactionary substantive agenda through unconstitutional mechanisms: the press is shut down; the legislature is typically eliminated; individual legal rights are ignored; a cult of personality is created around the leader; and enemies are neutralized through the use of violence.
While some of Trump’s rhetoric is undoubtedly consistent with fascism, I don’t see any real evidence yet that either he or his constituents have given up on the democratic process or the rule of law.