Wiktionary
overthrower
n. One who overthrows.
Usage examples of "overthrower".
Even now that he knew, it was hard to believe, hard to elevate the shambling has-been Gorochenko to the level of arch-plotter, overthrower of the state.
Kaiser Wilhelm had belatedly sent the Monarchists weapons to resist their would-be overthrowers, but things didn't look good for them even so.