naif vs naive

naif is a noun but naive is not a noun.

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

As adjectives, naif and naive are synonyms defined as:

naif and naive: marked by or showing unaffected simplicity and lack of guile or worldly experience

naif (noun)	naive (noun)
a naive or inexperienced person

naif (adjective)	naive (adjective)
marked by or showing unaffected simplicity and lack of guile or worldly experience	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