cockiness vs self-assertiveness

cockiness and self-assertiveness both are nouns.

Word	Noun	Adjective	Verb	Adverb
cockiness	Yes	No	No	No
self-assertiveness	Yes	No	No	No

As nouns, self-assertiveness is a hypernym of cockiness; that is, self-assertiveness is a word with a broader meaning than cockiness:

cockiness: offensive boldness and assertiveness
self-assertiveness: aggressive self-assurance; given to making bold assertions

Other hypernyms of cockiness include assertiveness.

cockiness (noun)	self-assertiveness (noun)
offensive boldness and assertiveness	aggressive self-assurance; given to making bold assertions