Per the FBI; terrorism = "the unlawful use of force or violence against persons or property to intimidate or coerce a government, the civilian population, or any segment thereof, in furtherance of political or social goals."
Furthermore, those who have sworn an oath to the Constitution and then warred against it such as an attempted coup, are guilty of treason. https://constitution.congress.gov/browse/essay/artIII-S3-C1-1-2/ALDE_00001226/
I'm curious if they will go after the vets and former elected officials who involved. AFAIK, it's never been tested in court, but the Oath to the Constitution is forever.
I think treason has to involve giving "aid and comfort" to the enemy which usually applies to foreign enemy. Also, it must be during times of war. The Rosenbergs gave secret atomic weapon information to the Soviets and were executed for espionage. They were not charged with treason because we were not at war.

