antiemetic vs medicament

antiemetic and medicament both are nouns.

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

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

antiemetic: 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 include medication, medicinal drug, medicine.

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