patent medicine vs medicament

patent medicine and medicament both are nouns.

Word	Noun	Adjective	Verb	Adverb
patent medicine	Yes	No	No	No
medicament	Yes	No	No	No

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

patent medicine: medicine that is protected by a patent and available without a doctor's prescription
medicament: (medicine) something that treats or prevents or alleviates the symptoms of disease

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

patent medicine (noun)	medicament (noun)
medicine that is protected by a patent and available without a doctor's prescription	(medicine) something that treats or prevents or alleviates the symptoms of disease