dethroner

/diˈθroʊnər/
noun
  1. A person or thing that removes a ruler from power.
    • The general was the dethroner of the corrupt monarch.
    • History remembers the dethroner as a revolutionary.
    • The rebels acted as dethroners of the old regime.
  2. A person or thing that defeats a reigning champion or top competitor.
    • The young athlete became the dethroner of the longtime champion.
    • The new software was the dethroner of the industry standard.
    • The underdog team emerged as the dethroner of the defending champions.
Antonyms
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