U / ūsurpātor
noun

ūsurpātor

gen. ūsurpātōris · gender masculine · decl. 3rd
one who uses; takes possession unlawfully; a usurper
one who uses or takes possession unlawfully, a usurper of a thing (late Lat.): indebitae potestatis, Amm. 26, 7, 12: tanti nominis, Symm. Or. ap. Val. 1, 22.—
one who accomplishes
In gen., one who accomplishes: ardui operis, Jul. Sev. Syn. praef. 1.