mydriatic vs drug

mydriatic and drug both are nouns.

Word	Noun	Adjective	Verb	Adverb
mydriatic	Yes	No	No	No
drug	Yes	No	Yes	No

As nouns, drug is a hypernym of mydriatic; that is, drug is a word with a broader meaning than mydriatic:

mydriatic: a drug that causes the pupil of the eye to dilate; used to aid eye examinations
drug: a substance that is used as a medicine or narcotic

mydriatic (noun)	drug (noun)
a drug that causes the pupil of the eye to dilate; used to aid eye examinations	a substance that is used as a medicine or narcotic

mydriatic (verb)	drug (verb)
	administer a drug to
	use recreational drugs