antidiarrheal vs medicament

antidiarrheal and medicament both are nouns.

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

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

antidiarrheal: a drug used to control or stop diarrhea
medicament: (medicine) something that treats or prevents or alleviates the symptoms of disease

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

antidiarrheal (noun)	medicament (noun)
a drug used to control or stop diarrhea	(medicine) something that treats or prevents or alleviates the symptoms of disease