narcotic

noun

soporific drug, opiate, sleeping pill, soporific;

painkiller, pain reliever, analgesic, anodyne, palliative, anaesthetic;

tranquillizer, sedative;

informal downer;

dated sleeping draught;

literary nepenthes;

rare stupefacient, stupefactive.

adjective

soporific, sleep-inducing, opiate, hypnotic;

painkilling, pain-relieving, analgesic, anodyne, anaesthetic, stupefying, numbing, dulling, tranquillizing, sedative, calming;

rare stupefacient, stuporific, stupefactive.

narcotic Oxford Dictionary of English