juvenile vs somebody

juvenile and somebody both are nouns.

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

As nouns, somebody is a hypernym of juvenile; that is, somebody is a word with a broader meaning than juvenile:

juvenile: a young person, not fully developed
somebody: a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential

Other hypernyms of juvenile include individual, mortal, person, someone, soul.

juvenile (noun)	somebody (noun)
a young person, not fully developed	a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential

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