sedative drug vs medicine

sedative drug and medicine both are nouns.

Word	Noun	Adjective	Verb	Adverb
sedative drug	Yes	No	No	No
medicine	Yes	No	Yes	No

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

sedative drug: a drug that reduces excitability and calms a person
medicine: (medicine) something that treats or prevents or alleviates the symptoms of disease

Other hypernyms of sedative drug include drug of abuse, street drug, medicament, medication, medicinal drug.

sedative drug (noun)	medicine (noun)
a drug that reduces excitability and calms a person	the learned profession that is mastered by graduate training in a medical school and that is devoted to preventing or alleviating or curing diseases and injuries
	punishment for one's actions
	(medicine) something that treats or prevents or alleviates the symptoms of disease
	the branches of medical science that deal with nonsurgical techniques

sedative drug (verb)	medicine (verb)
	treat medicinally, treat with medicine