demulcent vs medicinal drug

demulcent and medicinal drug both are nouns.

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

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

demulcent: a medication (in the form of an oil or salve etc.) that soothes inflamed or injured skin
medicinal drug: (medicine) something that treats or prevents or alleviates the symptoms of disease

Other hypernyms of demulcent include medicament, medication, medicine.

demulcent (noun)	medicinal drug (noun)
a medication (in the form of an oil or salve etc.) that soothes inflamed or injured skin	(medicine) something that treats or prevents or alleviates the symptoms of disease

demulcent (adjective)	medicinal drug (adjective)
having a softening or soothing effect especially to the skin