Unseats is a verb that means to remove someone from their position of power. There are a number of synonyms that could be used in place of unseats, including dethrone, depose, oust, supplant, and overthrow. Each of these words has slightly different connotations, but they all refer to the act of taking away someone's power or status. For example, depose is often used in reference to a monarch or government leader who is forcibly removed from office. Oust, on the other hand, can be used more broadly to refer to any situation where someone is removed from a position of authority. Regardless of which word is chosen, they all convey the idea of someone being displaced from their position of power.