Somniferous vs. Soporific: What's the Difference?

Somniferous and Soporific Definitions
Somniferous
Inducing sleep; soporific.
Soporific
Inducing or tending to induce sleep.
Somniferous
(pharmaceutical effect) causing or inducing sleep, normally with harmful overtones.
Soporific
Drowsy.
Somniferous
Causing or inducing sleep; soporific; dormitive; as, a somniferous potion.
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Soporific
A drug or other substance that induces sleep; a hypnotic.
Somniferous
Sleep inducing
Soporific
(pharmaceutical drug) Something inducing sleep, especially a drug.
The doctor prescribed a soporific to help the patient sleep.
Soporific
(figuratively) Something boring or dull.
Soporific
(pharmaceutical effect) Tending to induce sleep.
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Soporific
(figuratively) Boring, dull.
The professor delivered a soporific lecture.
Soporific
Causing sleep; tending to cause sleep; soporiferous; as, the soporific virtues of opium.
Soporific
A medicine, drug, plant, or other agent that has the quality of inducing sleep; a narcotic.
Soporific
A drug that induces sleep
Soporific
Sleep inducing
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Soporific
Inducing mental lethargy;
A narcotic speech