ἐξιχνευτής
From LSJ
ἐάν μή διδάξητε περί ἀρετὴς τούς τό ἀργύριον κλέψαντας, οὐ ταξόμεθα οἱ ὁπλῖται → if you don't teach those who have stolen money a lesson on moral virtue, we, the hoplites, will not line up
English (LSJ)
ἐξιχνευτοῦ, ὁ, one who tracks out, Glossaria.
German (Pape)
[Seite 884] ὁ, der Ausspürer, Schol. Ar.
Greek (Liddell-Scott)
ἐξιχνευτής: -οῦ, ὁ, ὁ ἐξιχνεύων, Γλωσσ.