medicament vs medicinal drug

medicament and medicinal drug both are nouns.

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

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

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

Other synonyms of medicament include medication, medicine.

medicament (noun)	medicinal drug (noun)
(medicine) something that treats or prevents or alleviates the symptoms of disease	(medicine) something that treats or prevents or alleviates the symptoms of disease