9 letters · 15 points in Scrabble
noun an official of the Communist Party who was assigned to teach party principles to a military unit
originBorrowed from Russian комисса́р (komissár), from German Kommissar (“commissioner”), from Latin commissarius, from commissus, past participle of committō (“to commit, entrust to”). Doublet of commissary.
Etymology from Wiktionary, CC BY-SA 3.0