child vs juvenile

child and juvenile both are nouns.

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

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

Other hypernyms of child include juvenile person.

child (noun)	juvenile (noun)
a young person of either sex	a young person, not fully developed
a human offspring (son or daughter) of any age
an immature childish person
a member of a clan or tribe

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