Strong's #6233: `osheq (pronounced o'-shek)
 from 6231; injury, fraud, (subjectively) distress, (concretely) unjust gain:--cruelly, extortion, oppression, thing (deceitfully gotten).
Brown-Driver-Briggs Hebrew Lexicon:
 ׁ 
  ‛ôsheq 
 
 1) oppression, extortion, injury
 
 1a) oppression
 1b) extortion
 1c) gain by extortion
 
  Part of Speech: noun masculine
Relation: from H6231
Usage:
This word is used 15 times:
Leviticus 6:4: "he took violently away, or  the thing which he hath deceitfully gotten, or"
Psalms 62:10: "Trust not  in oppression, and become not vain in robbery: if riches"
Psalms 73:8: "They are corrupt, and speak wickedly  concerning oppression: they speak loftily."
Psalms 119:134: "Deliver  me from the oppression of man: so will I keep thy precepts."
Ecclesiastes 5:8: "If thou seest  the oppression of the poor, and violent perverting of judgment and justice in a province,"
Ecclesiastes 7:7: "Surely  oppression maketh a wise man mad; and a gift destroyeth the heart."
Isaiah 30:12: "this word, and trust  in oppression and perverseness, and stay thereon:"
Isaiah 54:14: "In righteousness shalt thou be established: thou shalt be far  from oppression; for thou shalt not fear:"
Isaiah 59:13: "from our God, speaking  oppression and revolt, conceiving and uttering"
Jeremiah 6:6: "is the city to be visited; she is wholly  oppression in the midst"
Jeremiah 22:17: "and for to shed innocent blood, and for  oppression, and for violence,"
Ezekiel 18:18: "As for his father, because  he cruelly oppressed, spoiled his brother by violence, and did"
Ezekiel 22:7: "and mother: in the midst of thee have they dealt  by oppression with the stranger: in thee have they vexed the fatherless and the widow."
Ezekiel 22:12: "and increase, and thou hast greedily gained of thy neighbors  by extortion, and hast forgotten me, saith the Lord GOD."
Ezekiel 22:29: "The people of the land have used  oppression, and exercised robbery, and have vexed the poor"