naiveness vs naive

naiveness is a noun but naive is not a noun.

Word	Noun	Adjective	Verb	Adverb
naiveness	Yes	No	No	No
naive	No	Yes	No	No

naiveness (noun)	naive (noun)
lack of sophistication or worldliness

naiveness (adjective)	naive (adjective)
	marked by or showing unaffected simplicity and lack of guile or worldly experience
	not initiated; deficient in relevant experience
	inexperienced
	lacking information or instruction
	of or created by one without formal training; simple or naive in style