Usage: 3 forms in 3 verses
Form Translated As     In Verse(s)
πειρατών of his marauders LXX.Job.16.9
πειραταίσ for marauders LXX.Job.25.3
πειράτου a maruader LXX.Hos.6.9

Liddell-Scott-Jones

πειρατής (peiratēs) a marauder G:N-M

πειρατής-ᾱτής, οῦ, ,

brigand, [LXX+2nd c.BC+]; especially pirate, [Refs 2nd c.BC+]

LSJ Scripture Refs: LXX.Job.16.10