impertinence vs sauciness

impertinence and sauciness both are nouns.

Word	Noun	Adjective	Verb	Adverb
impertinence	Yes	No	No	No
sauciness	Yes	No	No	No

As nouns, impertinence and sauciness are synonyms defined as:

Other synonyms of impertinence include archness, perkiness, pertness.

impertinence (noun)	sauciness (noun)
inappropriate playfulness	inappropriate playfulness
the trait of being rude and impertinent; inclined to take liberties
an impudent statement