dilator vs drug

dilator and drug both are nouns.

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

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

dilator (noun)	drug (noun)
a surgical instrument that is used to dilate or distend an opening or an organ	a substance that is used as a medicine or narcotic
a drug that causes dilation
a muscle or nerve that dilates or widens a body part

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