effrontery vs assumption

effrontery and assumption both are nouns.

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

As nouns, effrontery and assumption are synonyms defined as:

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

Other synonyms of effrontery include presumption, presumptuousness.

effrontery (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