Impertinence vs Egotism - What's the difference?

In countable terms the difference between impertinence and egotism

is that impertinence is an instance of this; a moment of being impertinent while egotism is the result or product of being egoistic.

is that impertinence is lack of pertinence; irrelevance while egotism is a tendency to talk excessively about oneself.

(uncountable) Lack of pertinence; irrelevance.

(countable) An instance of this; a moment of being impertinent.

(uncountable) The fact or character of being out of place; inappropriateness.

insolence.

(wikipedia egotism)

(en-noun)

A tendency to talk excessively about oneself.

A belief that one is superior to or more important than others.

Egoism.

(countable) The result or product of being egoistic.

* pride, vanity, conceit * egocentrism, egoism