usurper
usur·per
noun
1.
one who wrongfully or illegally seizes and holds the place of another
Origin
From Middle English usurper, usurpour, usurpur, from Middle French usurpeur; equivalent to usurp + -er.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.