If you're searching for an alternative word for "stuporific," there are several options available. "Soporific" is a similar term that is used to describe something that induces drowsiness or sleep. Another word that operates in the same vein is "hypnotic," which refers to something that has a calming or soothing effect. "Narcotic" is another synonym that describes drugs that dull the senses and may cause sleepiness or stupor. "Sedative" is a word that is frequently used to describe tranquilizers or medications that have a calming effect on the body. Lastly, "slumberous" is a word that can be used to describe something that induces or encourages rest or sleep.