μυστήρ

From LSJ

ἐν γὰρ χερσὶ τέλος πολέμου, ἐπέων δ' ἐνὶ βουλῇ → War finds its end in arms, words find their end in debate (Iliad 16.630)

Source

German (Pape)

[Seite 223] ῆρος, ὁ, = μύστης (?).