depressant vs medicament

depressant and medicament both are nouns.

Word	Noun	Adjective	Verb	Adverb
depressant	Yes	Yes	No	No
medicament	Yes	No	No	No

As nouns, medicament is a hypernym of depressant; that is, medicament is a word with a broader meaning than depressant:

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

Other hypernyms of depressant include drug of abuse, street drug, medication, medicinal drug, medicine.

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

depressant (adjective)	medicament (adjective)
capable of depressing physiological or psychological activity or response by a chemical agent