herbal medicine vs medicament

herbal medicine and medicament both are nouns.

Word	Noun	Adjective	Verb	Adverb
herbal medicine	Yes	No	No	No
medicament	Yes	No	No	No

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

herbal medicine: a medicine made from plants and used to prevent or treat disease or promote health
medicament: (medicine) something that treats or prevents or alleviates the symptoms of disease

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

herbal medicine (noun)	medicament (noun)
the use of medicinal herbs to prevent or treat disease or promote health	(medicine) something that treats or prevents or alleviates the symptoms of disease
a medicine made from plants and used to prevent or treat disease or promote health