juvenile vs stripling

juvenile and stripling both are nouns.

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

As nouns, stripling is a hyponym of juvenile; that is, stripling is a word with a more specific, narrower meaning than juvenile:

juvenile (noun)	stripling (noun)
a young person, not fully developed	a juvenile between the onset of puberty and maturity

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