decongestant vs medicament

decongestant and medicament both are nouns.

Word	Noun	Adjective	Verb	Adverb
decongestant	Yes	No	No	No
medicament	Yes	No	No	No

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

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

Other hypernyms of decongestant include medication, medicinal drug, medicine.

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