Usage: 4 forms in 5 verses
Form Translated As     In Verse(s)
πειρατηρίου the band of marauders LXX.Ps.18.29
πειρατήριόν a trial LXX.Job.7.1
πειρατήριον a marauder LXX.Gen.49.19
πειρατήρια his marauders LXX.Job.19.12
trials LXX.Job.10.17

Liddell-Scott-Jones

πειρατήριον (peiratērion) a band of marauders G:N-N

πειρατήριον-ᾱτήριον,

Ionic dialect πειρατήριονητ-, τό, ={πεῖρα}, φόνια πειρατήριονατήρια the trial for murder, [LXX+5th c.BC+]; test, [Refs 5th c.BC+]; temptation, PLond.unpublished [Refs 4th c.AD+]

__II pirate's nest, [Refs 1st c.BC+]
__II.2 gang of brigands or pirates, [LXX+1st c.BC+]

LSJ Scripture Refs: LXX.Job.7.1LXX.Gen.49.19