overconfidence vs cocksureness

overconfidence and cocksureness both are nouns.

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

As nouns, overconfidence and cocksureness are synonyms defined as:

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

Other synonyms of overconfidence include certitude.

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