assurance vs sureness

assurance and sureness both are nouns.

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

As nouns, assurance and sureness are synonyms defined as:

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

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

assurance (noun)	sureness (noun)
freedom from doubt; belief in yourself and your abilities	the quality of being steady and unfailing
a statement intended to inspire confidence	freedom from doubt; belief in yourself and your abilities
a binding commitment to do or give or refrain from something
a British term for some kinds of insurance