mydriatic drug vs drug

mydriatic drug and drug both are nouns.

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

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

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