Upheaval.
First of all, upheaval is one word, not two. It means a violent disruption or change in something
fiery
The word "violent" is pretty mean.
turmoil
Coup d'etat means a sudden change of government by violent means.
The word root that means change is "morph."
'un violent' means 'a violent' in French.
You think probable to assassin.
The word violent forms the negative adjective nonviolent, the adverb nonviolently, and the noun nonviolence.There is also a seldom-used term "overviolent" meaning excessively violent.
metamorphosis
The Latin word for change is "mutatio."
Vituperation means verbal abuse or castigation; violent denunciation or condemnation