soporific vs drug

soporific and drug both are nouns.

Word	Noun	Adjective	Verb	Adverb
soporific	Yes	Yes	No	No
drug	Yes	No	Yes	No

As nouns, drug is a hypernym of soporific; that is, drug is a word with a broader meaning than soporific:

Other hypernyms of soporific include hypnagogue.

soporific (noun)	drug (noun)
a drug that induces sleep	a substance that is used as a medicine or narcotic

soporific (adjective)	drug (adjective)
sleep inducing
inducing mental lethargy

soporific (verb)	drug (verb)
	administer a drug to
	use recreational drugs