downer vs medicament

downer and medicament both are nouns.

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

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

downer: 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 downer include drug of abuse, street drug, medication, medicinal drug, medicine.

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