incertain vs confidence

incertain is not a noun while confidence is a noun.

Word	Noun	Adjective	Verb	Adverb
incertain	No	Yes	No	No
confidence	Yes	No	No	No

incertain (noun)	confidence (noun)
	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

incertain (adjective)	confidence (adjective)
lacking or indicating lack of confidence or assurance