prescription vs black and white

prescription and black and white both are nouns.

Word	Noun	Adjective	Verb	Adverb
prescription	Yes	Yes	No	No
black and white	Yes	Yes	No	No

As nouns, black and white is a hypernym of prescription; that is, black and white is a word with a broader meaning than prescription:

prescription: 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
black and white: communication by means of written symbols (either printed or handwritten)

Other hypernyms of prescription include written communication, written language.

As nouns, black and white is a hypernym of prescription; that is, black and white is a word with a broader meaning than prescription:

prescription: written instructions for an optician on the lenses for a given person
black and white: communication by means of written symbols (either printed or handwritten)

Other hypernyms of prescription include written communication, written language.

prescription (noun)	black and white (noun)
a drug that is available only with written instructions from a doctor or dentist to a pharmacist	a black-and-white photograph or slide
directions prescribed beforehand; the action of prescribing authoritative rules or directions	communication by means of written symbols (either printed or handwritten)
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

prescription (adjective)	black and white (adjective)
available only with a doctor's written prescription	not having or not capable of producing colors