purgative vs medicament

purgative and medicament both are nouns.

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

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

purgative: a purging medicine; stimulates evacuation of the bowels
medicament: (medicine) something that treats or prevents or alleviates the symptoms of disease

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

purgative (noun)	medicament (noun)
a purging medicine; stimulates evacuation of the bowels	(medicine) something that treats or prevents or alleviates the symptoms of disease

purgative (adjective)	medicament (adjective)
strongly laxative