self-assurance vs sureness

self-assurance and sureness both are nouns.

Word	Noun	Adjective	Verb	Adverb
self-assurance	Yes	No	No	No
sureness	Yes	No	No	No

As nouns, self-assurance and sureness are synonyms defined as:

self-assurance and sureness: freedom from doubt; belief in yourself and your abilities

Other synonyms of self-assurance include assurance, authority, confidence, self-confidence.

self-assurance (noun)	sureness (noun)
freedom from doubt; belief in yourself and your abilities	the quality of being steady and unfailing
	freedom from doubt; belief in yourself and your abilities