distention vs dilatation

distention and dilatation both are nouns.

Word	Noun	Adjective	Verb	Adverb
distention	Yes	No	No	No
dilatation	Yes	No	No	No

As nouns, distention and dilatation are synonyms defined as:

distention and dilatation: the state of being stretched beyond normal dimensions

Other synonyms of distention include distension.

distention (noun)	dilatation (noun)
the act of expanding by pressure from within	the act of expanding an aperture
the state of being stretched beyond normal dimensions	the state of being stretched beyond normal dimensions