The illegal part and a coup generally involves elements of force/violence none of which are true in this case. The Dems went after Trump because Trump lied, covered up and did deeds that they deemed abusive of his power. They followed the legal process and in the end Trump remained in office. That’s not a coup.
Put as much lip stick on your pig as you like. Coups don't necessarily have to be violent and bloodless coups are not unheard of. Plotters like Comey, Brennan etc. did indeed break the law in order to remove Trump so I'm not sure if you claim they broke no laws or not. But they did! So there's that.
The process the plotters followed was only legal if one didn't look too closely, like the FISA warrants
obtained by illegal means or the Steele dossier which was claimed to the courts and press as legitimate when it was nothing but a collection on fictitious nonsense gathered by a British espionage gadfly for a nice pay day.
Yes. The part about Trump remaining in office was not a coup. That however was not for lack of trying by Deep State creeps and lying scumbags.
You call it what you like. I know what it was. If you try to run down someone and don't quite hit your mark
murder was still attempted.