<unk> s include opiates, an older term that refers to such drugs derived from opium, including morphine itself. Other<unk> s are semi-synthetic and synthetic drugs such as hydrocodone, oxycodone and fentanyl; antagonist drugs such as naloxone; and endogenous peptides such as the endorphins. The terms opiate and narcotic are sometimes encountered as synonyms for<unk> . Opiate is properly limited to the natural alkaloids found in the resin of the opium poppy although some include semi-synthetic derivatives. Narcotic, derived from words meaning 'numbness' or 'sleep', as an American legal term, refers to cocaine and<unk> s, and their source materials; it is also loosely applied to any illegal or controlled psychoactive drug. In some jurisdictions all controlled drugs are legally classified as narcotics. The term can have pejorative connotations and its use is generally discouraged where that is the case.
Opioid
Heroin
Synthetic cannabinoids
Nicotine
Phencyclidine
Cocaine 
Cocaine
Benzphetamine