antiemetic drug vs medicament

antiemetic drug and medicament both are nouns.

Word	Noun	Adjective	Verb	Adverb
antiemetic drug	Yes	No	No	No
medicament	Yes	No	No	No

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

antiemetic drug: a drug that prevents or alleviates nausea and vomiting
medicament: (medicine) something that treats or prevents or alleviates the symptoms of disease

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

antiemetic drug (noun)	medicament (noun)
a drug that prevents or alleviates nausea and vomiting	(medicine) something that treats or prevents or alleviates the symptoms of disease