antihypertensive vs medicament

antihypertensive and medicament both are nouns.

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

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

antihypertensive: a drug that reduces high blood pressure
medicament: (medicine) something that treats or prevents or alleviates the symptoms of disease

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

antihypertensive (noun)	medicament (noun)
a drug that reduces high blood pressure	(medicine) something that treats or prevents or alleviates the symptoms of disease