cocksureness vs overconfidence

cocksureness and overconfidence both are nouns.

Word	Noun	Adjective	Verb	Adverb
cocksureness	Yes	No	No	No
overconfidence	Yes	No	No	No

As nouns, cocksureness and overconfidence are synonyms defined as:

cocksureness and overconfidence: total certainty or greater certainty than circumstances warrant

Other synonyms of cocksureness include certitude.

cocksureness (noun)	overconfidence (noun)
total certainty or greater certainty than circumstances warrant	total certainty or greater certainty than circumstances warrant