We found one dictionary that defines the word usurpator:

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1. usurpator: Wiktionary

Definitions from Wiktionary (usurpator) ▸ noun:  A usurper. ▸ Words similar to usurpator ▸ Usage examples for usurpator ▸ Idioms related to usurpator ▸ Wikipedia articles (New!) ▸ Popular adjectives describing usurpator ▸ Words that often appear near usurpator ▸ Rhymes of usurpator ▸ Invented words related to usurpator