decongestant vs medicinal drug

decongestant and medicinal drug both are nouns.

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

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

decongestant: a drug that decreases pulmonary congestion
medicinal drug: (medicine) something that treats or prevents or alleviates the symptoms of disease

Other hypernyms of decongestant include medicament, medication, medicine.

decongestant (noun)	medicinal drug (noun)
a drug that decreases pulmonary congestion	(medicine) something that treats or prevents or alleviates the symptoms of disease