juvenile person vs juvenile

juvenile person and juvenile both are nouns.

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

As nouns, juvenile person and juvenile are synonyms defined as:

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

juvenile person (adjective)	juvenile (adjective)
	of or relating to or characteristic of or appropriate for children or young people
	displaying or suggesting a lack of maturity