assumption vs presumptuousness

assumption and presumptuousness both are nouns.

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

As nouns, assumption and presumptuousness are synonyms defined as:

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

Other synonyms of assumption include effrontery, presumption.

assumption (noun)	presumptuousness (noun)
the act of taking possession of or power over something	audacious (even arrogant) behavior that you have no right to
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