An addictive narcotic is a drug that can cause physical and psychological dependence. The three crossword solutions for the term 'addictive narcotic' are OPIATE (6 letters), OPIUM (5 letters), and COCAINE (7 letters). OPIATE is a general term for any drug derived from the OPIUM poppy plant, including OPIUM and morphine. OPIUM is a highly addictive narcotic drug made from the OPIUM poppy plant. COCAINE is a powerful stimulant drug derived from the coca plant.