jejune vs juvenile

jejune is not a noun while juvenile is a noun.

Word	Noun	Adjective	Verb	Adverb
jejune	No	Yes	No	No
juvenile	Yes	Yes	No	No

As adjectives, jejune and juvenile are synonyms defined as:

Other synonyms of jejune include adolescent, puerile.

jejune (noun)	juvenile (noun)
	a young person, not fully developed

jejune (adjective)	juvenile (adjective)
displaying or suggesting a lack of maturity	of or relating to or characteristic of or appropriate for children or young people
of insufficient quantity to meet a need	displaying or suggesting a lack of maturity
lacking interest or significance or impact