confidence vs self-assurance

confidence and self-assurance both are nouns.

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

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

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

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

confidence (noun)	self-assurance (noun)
freedom from doubt; belief in yourself and your abilities	freedom from doubt; belief in yourself and your abilities
a secret that is confided or entrusted to another
a feeling of trust (in someone or something)
a state of confident hopefulness that events will be favorable
a trustful relationship