drug cocktail vs medicinal drug

drug cocktail and medicinal drug both are nouns.

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

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

drug cocktail: a combination of protease inhibitors taken with reverse transcriptase inhibitors; used in treating AIDS and HIV
medicinal drug: (medicine) something that treats or prevents or alleviates the symptoms of disease

Other hypernyms of drug cocktail include medicament, medication, medicine.

drug cocktail (noun)	medicinal drug (noun)
a combination of protease inhibitors taken with reverse transcriptase inhibitors; used in treating AIDS and HIV	(medicine) something that treats or prevents or alleviates the symptoms of disease