medication vs medicinal drug

medication and medicinal drug both are nouns.

Word	Noun	Adjective	Verb	Adverb
medication	Yes	No	No	No
medicinal drug	Yes	No	No	No

As nouns, medication and medicinal drug are synonyms defined as:

medication and medicinal drug: (medicine) something that treats or prevents or alleviates the symptoms of disease

Other synonyms of medication include medicament, medicine.

medication (noun)	medicinal drug (noun)
the act of treating with medicines or remedies	(medicine) something that treats or prevents or alleviates the symptoms of disease
(medicine) something that treats or prevents or alleviates the symptoms of disease