avenger
From LSJ
τίς δ' οἶδεν εἰ τὸ ζῆν μέν ἐστι κατθανεῖν, τὸ κατθανεῖν δὲ ζῆν κάτω νομίζεται → who knows if life is death, and if in the underworld death is considered life
English > Greek (Woodhouse)
substantive
P. and V. τιμωρός, ὁ or ἡ, V. ποινάτωρ, ὁ, τιμάορος, ὁ or ἡ, δικηφόρος, ὁ or ἡ, πράκτωρ, ὁ.
avenger of a father's death: V. πατρὶ τιμωρὸς φόνου (Sophocles, Electra 14).
I will become the avenger of my children's blood: V. τέκνοις δικαστὴς αἵματος γενήσομαι (Eur., Hercules Furens 1150).