antitussive vs medicament

antitussive and medicament both are nouns.

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

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

antitussive: any medicine used to suppress or relieve coughing
medicament: (medicine) something that treats or prevents or alleviates the symptoms of disease

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

antitussive (noun)	medicament (noun)
any medicine used to suppress or relieve coughing	(medicine) something that treats or prevents or alleviates the symptoms of disease