dilater vs surgical instrument

dilater and surgical instrument both are nouns.

Word	Noun	Adjective	Verb	Adverb
dilater	Yes	No	No	No
surgical instrument	Yes	No	No	No

As nouns, surgical instrument is a hypernym of dilater; that is, surgical instrument is a word with a broader meaning than dilater:

dilater: a surgical instrument that is used to dilate or distend an opening or an organ
surgical instrument: a medical instrument used in surgery

dilater (noun)	surgical instrument (noun)
a surgical instrument that is used to dilate or distend an opening or an organ	a medical instrument used in surgery