A "riot" is defined as a violent disturbance of the peace by a crowd.

An "insurrection" is an organized and usually violent act of revolt or rebellion against an established government or governing authority of a nation-state or other political entity by a group of its citizens or subjects.

Some believe Jan 6th was an insurrection, others believe it was a riot, but did not rise to the level of insurrection.

Either way, it was an alarming and dangerous situation that struck real fear in many people.