presumptuousness vs assumption

presumptuousness and assumption both are nouns.

Word	Noun	Adjective	Verb	Adverb
presumptuousness	Yes	No	No	No
assumption	Yes	No	No	No

As nouns, presumptuousness and assumption are synonyms defined as:

presumptuousness and assumption: audacious (even arrogant) behavior that you have no right to

Other synonyms of presumptuousness include effrontery, presumption.

presumptuousness (noun)	assumption (noun)
audacious (even arrogant) behavior that you have no right to	the act of taking possession of or power over something
	the act of assuming or taking for granted
	audacious (even arrogant) behavior that you have no right to
	a hypothesis that is taken for granted
	a statement that is assumed to be true and from which a conclusion can be drawn