antiemetic vs Dramamine

antiemetic and Dramamine both are nouns.

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

As nouns, Dramamine is a hyponym of antiemetic; that is, Dramamine is a word with a more specific, narrower meaning than antiemetic:

antiemetic: a drug that prevents or alleviates nausea and vomiting
Dramamine: antihistamine and antiemetic (trade name Dramamine) used to treat motion sickness

Other hyponyms of antiemetic include dimenhydrinate, Emetrol, prochlorperazine, Phenergan, promethazine.

antiemetic (noun)	Dramamine (noun)
a drug that prevents or alleviates nausea and vomiting	antihistamine and antiemetic (trade name Dramamine) used to treat motion sickness