sedative vs medication

sedative and medication both are nouns.

Word	Noun	Adjective	Verb	Adverb
sedative	Yes	Yes	No	No
medication	Yes	No	No	No

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

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

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

sedative (noun)	medication (noun)
a drug that reduces excitability and calms a person	the act of treating with medicines or remedies
	(medicine) something that treats or prevents or alleviates the symptoms of disease

sedative (adjective)	medication (adjective)
tending to soothe or tranquilize