narcotic vs soporific

narcotic and soporific both are nouns.

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

As adjectives, narcotic and soporific are synonyms defined as:

Other synonyms of narcotic include soporiferous.

narcotic (noun)	soporific (noun)
a drug that produces numbness or stupor; often taken for pleasure or to reduce pain; extensive use can lead to addiction	a drug that induces sleep

narcotic (adjective)	soporific (adjective)
of or relating to or designating narcotics	sleep inducing
inducing stupor or narcosis	inducing mental lethargy
inducing mental lethargy