operate on vs medicine

operate on is not a noun while medicine is a noun.

Word	Noun	Adjective	Verb	Adverb
operate on	No	No	Yes	No
medicine	Yes	No	Yes	No

operate on (noun)	medicine (noun)
	the learned profession that is mastered by graduate training in a medical school and that is devoted to preventing or alleviating or curing diseases and injuries
	punishment for one's actions
	(medicine) something that treats or prevents or alleviates the symptoms of disease
	the branches of medical science that deal with nonsurgical techniques

operate on (verb)	medicine (verb)
perform surgery on	treat medicinally, treat with medicine