τῶν γὰρ μετρίων πρῶτα μὲν εἰπεῖν τοὔνομα νικᾷ → the first mention of the word moderation wins the game (Euripides, Medea 125f.)
helper, associate: P. and V. συνεργός, ὁ or ἡ, συλλήπτωρ, ὁ, κοινωνός, ὁ or ἡ, P. συναγωνιστής, ὁ.
state agent: P. πρόξενος, ὁ.
hireling: Ar. and P. μισθωτός, ὁ.
he who acts: P. and V. ὁ δρῶν.