Following is a drug primer by classification including their common names. 

Stimulants
Amphetamines, cocaine, crack, tobacco
Depressants
Alcohol, barbiturates, tranquilizers, Quaaludes
Hallucinogens
Marijuana, LSD, PCP, peyote/mescaline
Inhalants
Glue, nail polish remover, gasoline
Opiates
Opium, Heroin, Methadone, Fentanyl 
Psychotropic Prescription Drugs for Psychiatric Disorders
Haloperidol, chlorpromazine, thioridazine
Prescription Drugs
Morphine, Oxycodone, OxyContin, Vicodin