anodyne vs medicinal drug

anodyne and medicinal drug both are nouns.

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

As nouns, medicinal drug is a hypernym of anodyne; that is, medicinal drug is a word with a broader meaning than anodyne:

anodyne: a medicine used to relieve pain
medicinal drug: (medicine) something that treats or prevents or alleviates the symptoms of disease

Other hypernyms of anodyne include medicament, medication, medicine.

anodyne (noun)	medicinal drug (noun)
a medicine used to relieve pain	(medicine) something that treats or prevents or alleviates the symptoms of disease

anodyne (adjective)	medicinal drug (adjective)
capable of relieving pain