antihistamine vs medicament

antihistamine and medicament both are nouns.

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

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

antihistamine: a medicine used to treat allergies and hypersensitive reactions and colds; works by counteracting the effects of histamine on a receptor site
medicament: (medicine) something that treats or prevents or alleviates the symptoms of disease

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

antihistamine (noun)	medicament (noun)
a medicine used to treat allergies and hypersensitive reactions and colds; works by counteracting the effects of histamine on a receptor site	(medicine) something that treats or prevents or alleviates the symptoms of disease