curative vs medicinal drug

curative and medicinal drug both are nouns.

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

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

curative: a medicine or therapy that cures disease or relieve pain
medicinal drug: (medicine) something that treats or prevents or alleviates the symptoms of disease

Other hypernyms of curative include medicament, medication, medicine.

curative (noun)	medicinal drug (noun)
a medicine or therapy that cures disease or relieve pain	(medicine) something that treats or prevents or alleviates the symptoms of disease

curative (adjective)	medicinal drug (adjective)
tending to cure or restore to health