juvenility vs youth

juvenility and youth both are nouns.

Word	Noun	Adjective	Verb	Adverb
juvenility	Yes	No	No	No
youth	Yes	No	No	No

As nouns, juvenility and youth are synonyms defined as:

juvenility and youth: the freshness and vitality characteristic of a young person

Other synonyms of juvenility include youthfulness.

juvenility (noun)	youth (noun)
the freshness and vitality characteristic of a young person	the freshness and vitality characteristic of a young person
lacking and evidencing lack of experience of life	young people collectively
	a young person (especially a young man or boy)
	early maturity; the state of being young or immature or inexperienced
	the time of life between childhood and maturity
	an early period of development