tyrant
ty.rant \'ti--r*nt\ n [ME tirant, fr. OF tyran, tyrant, fr. L tyrannus, fr. G]k tyrannos 1: an absolute ruler unrestrained by law or constitution : a usurper of s overeignty 2a: a ruler who exercises absolute power oppressively or brutally 2b: one resembling such a tyrant in the harsh use of authority or power