assurance vs uncertain

assurance is a noun but uncertain is not a noun.

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

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

assurance (adjective)	uncertain (adjective)
	not established beyond doubt; still undecided or unknown
	lacking or indicating lack of confidence or assurance
	not certain to occur; not inevitable
	not established or confirmed
	ambiguous (especially in the negative)
	not consistent or dependable
	subject to change