Drug addict and Hophead

Drug addict noun - A narcotics addict.

Hophead and drug addict are semantically related in addict topic. In some cases you can use "Hophead" instead a noun phrase "Drug addict", when it comes to topics like druggie, person addicted to narcotics.

Hophead noun - A person who regularly uses drugs especially illegally.

Drug addict and hophead are semantically related in addict topic. You can use "Drug addict" instead a noun "Hophead", if it concerns topics such as druggie.