vasodilator vs dilator

vasodilator and dilator both are nouns.

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

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

vasodilator (noun)	dilator (noun)
a drug that causes dilation of blood vessels	a surgical instrument that is used to dilate or distend an opening or an organ
	a drug that causes dilation
	a muscle or nerve that dilates or widens a body part