juvenile vs shaver

juvenile and shaver both are nouns.

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

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

juvenile (noun)	shaver (noun)
a young person, not fully developed	a razor powered by an electric motor
	a young person of either sex
	an adult male who shaves

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