impertinence vs impertinent

impertinence is a noun but impertinent is not a noun.

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

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

impertinence (adjective)	impertinent (adjective)
	improperly forward or bold
	not pertinent to the matter under consideration
	characterized by a lightly pert and exuberant quality