ἀντεργάτης
From LSJ
ταῦτα δὲ ἔδει ποιῆσαι κἀκεῖνα μὴ ἀφιέναι → these things should have been done without neglecting the others | these are the things you should have done without neglecting the others | these ought ye to have done, and not to leave the other undone
Spanish (DGE)
-ου, ὁ antagonista, oponente πάσης τῆς ἐναρέτου πολιτείας ἀντεργάται Basil.M.31.640C.