centurión
From LSJ
Δελφῖνα νήχεσθαι διδάσκεις: ἐπὶ τῶν ἐν ἐκείνοις τινὰ παιδοτριβούντων, ἐν οἷς ἤσκηται → Teaching dolphins to swim: is applied to those who are teaching something among people who are already well versed in it
Spanish > Greek
ἑκατοντάρχης, ἑκατόνταρχος, ἑκατοντάρχας, κεντουρίων, κεντυρίων