9 letters · 10 points in Scrabble
noun a member of an irregular armed force that fights a stronger force by sabotage and harassment
noun merchandise that has imperfections; usually sold at a reduced price without the brand name
adjective contrary to rule or accepted order or general practice
originFrom Middle English irreguler, from Old French irreguler, from Medieval Latin or Late Latin irrēgulāris, from in- + regularis, equivalent to ir- + regular.
Etymology from Wiktionary, CC BY-SA 3.0