cognizant vs cognizance

cognizant is not a noun while cognizance is a noun.

Word	Noun	Adjective	Verb	Adverb
cognizant	No	Yes	No	No
cognizance	Yes	No	No	No

cognizant (noun)	cognizance (noun)
	having knowledge of
	range of what one can know or understand
	range or scope of what is perceived

cognizant (adjective)	cognizance (adjective)
(sometimes followed by `of') having or showing knowledge or understanding or realization or perception