Русско-англо-русский юридический словарь

Chancellor (Latin: cancellarius) is a title of various official positions in the governments of many nations. The original chancellors were the cancellarii of Roman courts of justice—ushers, who sat at the cancelli or lattice work screens of a basilica or law court, which separated the judge and counsel from the audience. A chancellor's office is called a chancellery or chancery. The word is now used in the titles of many various officers in all kinds of settings (government, education, religion). (Wikipedia)

The spellings adviser and advisor are both correct. Adviser is more common, but advisor is also widely used, especially in North America. Adviser may be seen as less formal, while advisor often suggests an official position (Oxford Dictionary)

As of year’s end, 87 sitting or former public servants had been charged with corruption. This included 14 cases of fraud committed using official position, 10 cases of misappropriation or embezzlement using official position, eight cases of nonviolent misuse of official powers for personal gain, eight cases of nonviolent exceeding of official powers, one case of illegal participation in entrepreneurial activities while taking advantage of official position, 30 cases of bribery, and 16 cases of creating a fraudulent official document for personal gain. (U.S. Department of State)