dilatation vs enlargement

dilatation and enlargement both are nouns.

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

As nouns, enlargement is a hypernym of dilatation; that is, enlargement is a word with a broader meaning than dilatation:

dilatation: the act of expanding an aperture
enlargement: the act of increasing (something) in size or volume or quantity or scope

Other hypernyms of dilatation include expansion.

dilatation (noun)	enlargement (noun)
the act of expanding an aperture	the act of increasing (something) in size or volume or quantity or scope
the state of being stretched beyond normal dimensions	a photographic print that has been enlarged
	a discussion that provides additional information
	the state of being enlarged