τυραννοκτόνος
From LSJ
ὃν οὐ τύπτει λόγος οὐδὲ ῥάβδος → if words don't get through, neither a beating will | if the carrot doesn't work, the stick will not work either | whom words do not strike, neither does the rod
English (LSJ)
(parox.), ὁ, ἡ,
A slayer of a tyrant, D.S.16.14, Plu.2.256f, Luc. Tyr.1, Lib.Decl.43.32:—as Adj., πάθος, τιμαὶ τ., of slaying a tyrant, Phalar.Ep.70.1.