27
narcotic(noun, adjective, medicine, dull, quiet)
20
sedative(noun, adjective, medicine, dull, quiet)
20
soporific(noun, adjective, drug, awareness, sleepy)
18
hypnotic(noun, adjective, medicine, drug, medication)
13
drug(noun, verb, medicine, treatment, medication)
13
anodyne(noun, adjective, medicine, drug, medication)
12
dope(noun, verb, phrasal verb, medicine, treatment)
11
anesthetic
9
tranquillizer(noun, sedative)
8
calmative(noun, adjective, sedative)
8
downer(noun, drug)
7
opium(noun, drug, moderation, narcotic)
7
somnifacient(noun, adjective, awareness, sleepy, dope)
6
analgesic(noun, medicine, medication, dope, merchandise)
6
somniferous(noun, adjective, dull, quiet, slow)
6
somnolent(adjective, dull, quiet, heavy, awareness)
5
hallucinogen(noun, drug, substance, drugs)
5
morphine
5
pacifier
5
tranquilizer(noun, drug)
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APASmart Define. (2015). opiate thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/opiate/thesaurus/synonyms
ChicagoSmart Define. 2015. "opiate thesaurus" https://smartdefine.org/opiate/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, opiate thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/opiate/thesaurus/synonyms>.
MLASmart Define. "opiate thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/opiate/thesaurus/synonyms>