usurpator means A usurper. Lexicurio rates it Sui generis — a strength score of 93 out of 100.
Etymology
From Middle French usurpateur or Late Latin ūsūrpātor.
noun
- A usurper.“Great God restore us our liberties, / With our ancient Laws and Customes, / Under the Iron yoak of Usurpators, / And lead us not”