Heroin is
diacetylmorphine(chemically)
Heroin is chemically diacetylmorphine, also known as diamorphine. It falls under the opioids category of drugs that have narcotic, analgesic, sedative and astringent effects. It is a white, crystalline, odourless and bitter compound obtained by the acetylation of morphine.
Cannabinoids include marijuana, hash and bhang. Cocaine is commonly called coke or crack.