placebo vs medicament

placebo and medicament both are nouns.

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

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

placebo: an innocuous or inert medication; given as a pacifier or to the control group in experiments on the efficacy of a drug
medicament: (medicine) something that treats or prevents or alleviates the symptoms of disease

Other hypernyms of placebo include medication, medicinal drug, medicine.

placebo (noun)	medicament (noun)
(Roman Catholic Church) vespers of the office for the dead	(medicine) something that treats or prevents or alleviates the symptoms of disease
an innocuous or inert medication; given as a pacifier or to the control group in experiments on the efficacy of a drug