antidiuretic vs medicament

antidiuretic and medicament both are nouns.

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

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

antidiuretic: a drug that limits the formation of urine
medicament: (medicine) something that treats or prevents or alleviates the symptoms of disease

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

antidiuretic (noun)	medicament (noun)
a drug that limits the formation of urine	(medicine) something that treats or prevents or alleviates the symptoms of disease