Coup d'état
Change of government by establishing political infrastructure by extra-constitutional means. Breach of the constitutional order for regime change by imposition of new government.
Revolution, killing the tyrant, re-placing the president without due process, dear child bear many names: Coup d’état is any change of government the than the process prescribed by the constitutional order. Whenever the procedure of establishing a government is breached, we speak of coup d’état. It is not a normative concept, but it may have a negative ring to it in some discourse; it is something the others do. When we do it, it is usually called a revolution, or otherwise coated in glamour. Edward Luttwak road a handbook with substantive advice on how to go about it, that was updated in a second edition (2016). A good advice is to gain control of armed forces and whomever could demand legitimacy of ruling as well of having a successor to the throne ready to step in and fill the power vacuum left from the removal of the president or king or junta in charge.