S: (n) heroin, diacetylmorphine (a narcotic that is considered a hard drug; a highly addictive morphine derivative; intravenous injection provides the fastest and most intense rush)
S: (n) opiate (a narcotic drug that contains opium or an opium derivative)
S: (n) narcotic (a drug that produces numbness or stupor; often taken for pleasure or to reduce pain; extensive use can lead to addiction)
S: (n) drug (a substance that is used as a medicine or narcotic)
S: (n) agent (a substance that exerts some force or effect)