Major political convulsions can be described using a variety of synonyms. One could use the term "upheaval" to describe sudden and significant changes in the political sphere. Alternatively, "turmoil" or "chaos" may be used to indicate a more tumultuous and unrestful shift in the political situation. "Crisis" implies a pressing and urgent situation that demands immediate attention and action. "Disruption" suggests a disturbance or interruption to the normal functioning of politics. Finally, "revolution" suggests a complete and radical change to the existing political system, often through force. All of these synonyms effectively convey the gravity and significance of major political convulsions.