juvenile vs juvenile person

juvenile and juvenile person both are nouns.

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

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

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

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