The word(s) "oppressor" appears 17 time(s) in 17 verse(s) in Quran in Mohsin Khan translation.

(1) And what is wrong with you that you fight not in the Cause of Allah, and for those weak, ill-treated and oppressed among men, women, and children, whose cry is: "Our Lord! Rescue us from this town whose people are oppressors; and raise for us from You one who will protect, and raise for us from You one who will help."

(2) And who does more wrong than he who invents a lie against Allah. Such will be brought before their Lord, and the witnesses will say, "These are the ones who lied against their Lord!" No doubt! the curse of Allah is on the Zalimun (polytheists, wrong-doers, oppressors).

(3) "And I do not say to you that with me are the Treasures of Allah, nor that I know the Ghaib (Unseen), nor do I say I am an angel, and I do not say of those whom your eyes look down upon that Allah will not bestow any good on them. Allah knows what is in their inner-selves (as regards belief, etc.). In that case, I should, indeed be one of the Zalimun (wrong-doers, oppressors)."

(4) Such were 'Ad (people). They rejected the Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) of their Lord and disobeyed His Messengers, and followed the command of every proud obstinate (oppressor of the truth, from their leaders).

(5) And when you have embarked on the ship, you and whoever is with you, then say: "All the praises and thanks be to Allah, Who has saved us from the people who are Zalimun (i.e. oppressors, wrong-doers, polytheists, those who join others in worship with Allah).

(6) "Our Lord! Bring us out of this. If ever we return (to evil), then indeed we shall be Zalimun: (polytheists, oppressors, unjust, and wrong-doers)."

(7) And (remember) the Day when the Zalim (wrong-doer, oppressor, polytheist) will bite at his hands, he will say: "Oh! Would that I had taken a path with the Messenger (Muhammad صلى الله عليه وسلم).

(8) And none has brought us into error except the Mujrimun [Iblis (Satan) and those of human beings who commit crimes, murderers, polytheists, oppressors].

(9) Verily, Fir'aun (Pharaoh) exalted himself in the land and made its people sects, weakening (oppressing) a group (i.e. Children of Israel) among them: killing their sons, and letting their females live. Verily, he was of the Mufsidun (i.e. those who commit great sins and crimes, oppressors, tyrants).

(10) And never will your Lord destroy the towns (populations) until He sends to their mother town a Messenger reciting to them Our Verses. And never would We destroy the towns unless the people thereof are Zalimun (polytheists, wrong-doers, disbelievers in the Oneness of Allah, oppressors and tyrants).