methacholine vs medication

methacholine and medication both are nouns.

Word	Noun	Adjective	Verb	Adverb
methacholine	Yes	No	No	No
medication	Yes	No	No	No

As nouns, medication is a hypernym of methacholine; that is, medication is a word with a broader meaning than methacholine:

methacholine: parasympathomimetic drug (trademark Mecholyl) that stimulates secretions and smooth muscle activity
medication: (medicine) something that treats or prevents or alleviates the symptoms of disease

Other hypernyms of methacholine include medicament, medicinal drug, medicine.

methacholine (noun)	medication (noun)
parasympathomimetic drug (trademark Mecholyl) that stimulates secretions and smooth muscle activity	the act of treating with medicines or remedies
	(medicine) something that treats or prevents or alleviates the symptoms of disease