assure vs assurance

assure is not a noun while assurance is a noun.

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

assure (noun)	assurance (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

assure (verb)	assurance (verb)
be careful or certain to do something; make certain of something
inform positively and with certainty and confidence
assure somebody of the truth of something with the intention of giving the listener confidence
make a promise or commitment
make certain of