tolazoline vs vasodilator

tolazoline and vasodilator both are nouns.

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

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

tolazoline: vasodilator that is used to treat spasms of peripheral blood vessels (as in acrocyanosis)
vasodilator: a drug that causes dilation of blood vessels

Other hypernyms of tolazoline include vasodilative.

tolazoline (noun)	vasodilator (noun)
vasodilator that is used to treat spasms of peripheral blood vessels (as in acrocyanosis)	a drug that causes dilation of blood vessels