The term 'Drug Buster' is used to describe a person who works to stop the illegal sale and use of drugs. The two crossword solutions for this term are 'NARCO' (5 letters) and 'NARC' (4 letters). NARCO stands for Narcotics Officer, which is a law enforcement officer who specializes in the investigation and prevention of drug-related crimes. NARC stands for Narcotics Agent, which is a federal agent who investigates and prosecutes drug-related offenses. Both of these terms refer to individuals who work to combat the illegal drug trade.