With the utmost sympathy for those who have experienced coups and aware of the crap "enlightened" governments pull around the world...
I do want to say that gatekeeping and shaming of the form "using [word X] is insensitive to the people of real [word X]" is one of the trends that is amplifying division in the US. There's probably a better way we can acknowledge worse problems without inadvertently damaging discourse.
That said... an attempted coup can take many forms.
This was not on the same level, but I don't think it's helpful to deny that the objective of these guys was to overturn the election and they had institutional support from the President, legislators, and it appears the Capitol Police. Off duty cops and military were in the crowd. It just wasn't sufficient or well enough planned.
In my opinion, what we witnessed is the farce part of the classic quote: "Hegel remarks somewhere that all great world-historic facts and personages appear, so to speak, twice. He forgot to add: the first time as tragedy, the second time as farce."
Was it clumsy? Yes. Doomed to failure? Absolutely. But make no mistake, had the crowd encountered some of the members of congress they dislike it would have ended much more poorly.
I don't think it's much of a stretch to call it an uncoordinated, ham-fisted attempt at a coup.
How is that not an attempted coup d'etat?