herbal medicine vs medication

herbal medicine and medication both are nouns.

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

As nouns, medication is a hypernym of herbal medicine; that is, medication 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
medication: (medicine) something that treats or prevents or alleviates the symptoms of disease

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

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