simple vs naive

simple is a noun but naive is not a noun.

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

simple (noun)	naive (noun)
a person lacking intelligence or common sense
any herbaceous plant having medicinal properties

simple (adjective)	naive (adjective)
(botany) of leaf shapes; of leaves having no divisions or subdivisions	marked by or showing unaffected simplicity and lack of guile or worldly experience
having few parts; not complex or complicated or involved	not initiated; deficient in relevant experience
easy and not involved or complicated	inexperienced
exhibiting childlike simplicity and credulity	lacking information or instruction
unornamented	of or created by one without formal training; simple or naive in style
lacking mental capacity and subtlety
apart from anything else; without additions or modifications