dilater vs dilator

dilater and dilator both are nouns.

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

As nouns, dilater and dilator are synonyms defined as:

dilater and dilator: a surgical instrument that is used to dilate or distend an opening or an organ

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