dilatation vs distension

dilatation and distension both are nouns.

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

As nouns, dilatation and distension are synonyms defined as:

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

Other synonyms of dilatation include distention.

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