8 letters · 11 points in Scrabble
noun a government agent responsible for collecting revenue (especially one responsible for stopping bootlegging)
originFrom revenue + -er, reflecting the U.S. Treasury Department's former Bureau of Internal Revenue (a predecessor of the IRS and ATF), because the administrative mechanism for enforcing Prohibition originated in excise tax administration; Wikipedia gives details at Bureau of Alcohol, Tobacco, Firearms and Explosives § History.
Etymology from Wiktionary, CC BY-SA 3.0