nonprescription vs prescription

nonprescription is not a noun while prescription is a noun.

Word	Noun	Adjective	Verb	Adverb
nonprescription	No	Yes	No	No
prescription	Yes	Yes	No	No

nonprescription (noun)	prescription (noun)
	a drug that is available only with written instructions from a doctor or dentist to a pharmacist
	directions prescribed beforehand; the action of prescribing authoritative rules or directions
	written instructions from a physician or dentist to a druggist concerning the form and dosage of a drug to be issued to a given patient
	written instructions for an optician on the lenses for a given person

nonprescription (adjective)	prescription (adjective)
purchasable without a doctor's prescription	available only with a doctor's written prescription