narcotic

nouns

a drug that produces numbness or stupor; often taken for pleasure or to reduce pain; extensive use can lead to addiction
narcotic
is derived from
narcotize
is a type of (narrower)
a substance that is used as a medicine or narcotic
drug

adjectives

of or relating to or designating narcotics
"narcotic addicts"; "narcotic stupor"
narcotic
inducing stupor or narcosis
"narcotic drugs"
narcotic, narcotising, narcotizing
is derived from
narcosis
inducing mental lethargy
"a narcotic speech"
narcotic, soporiferous, soporific