antidiabetic vs medicinal drug

antidiabetic and medicinal drug both are nouns.

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

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

antidiabetic: a drug used to treat diabetes mellitus
medicinal drug: (medicine) something that treats or prevents or alleviates the symptoms of disease

Other hypernyms of antidiabetic include medicament, medication, medicine.

antidiabetic (noun)	medicinal drug (noun)
a drug used to treat diabetes mellitus	(medicine) something that treats or prevents or alleviates the symptoms of disease