antiemetic vs medication

antiemetic and medication both are nouns.

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

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

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

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

antiemetic (noun)	medication (noun)
a drug that prevents or alleviates nausea and vomiting	the act of treating with medicines or remedies
	(medicine) something that treats or prevents or alleviates the symptoms of disease