Disseat means to unseat or remove someone from a position of power or authority. There are several synonyms for this word including dethrone, depose, oust, topple, and overthrow. Dethrone means to remove someone from a position of power or authority usually by force, while depose refers to the same action but in a legal setting. Oust means to force someone out of a position or place, while topple means to cause someone to lose their position or power. Overthrow is a more violent synonym that implies the use of force to remove someone from power. All of these words convey the idea of removing someone from a position of authority or power.